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Minor League Baseball

From Wikipedia, the free encyclopedia

Minor League Baseball
FoundedSeptember 5, 1901; 122 years ago (1901-09-05)
No. of teams208
CountriesUnited States (157 teams)
Canada (1 team) +
Dominican Republic (Rookie League) (50 teams)
(as of 2024 season)
HeadquartersNew York City, U.S.
TV partner(s)Stadium,
Bally Live App, local tv stations

Minor League Baseball (MiLB) is a professional baseball organization below Major League Baseball (MLB), including teams affiliated with MLB clubs.

Entering the 2021 season, the number of full-season MLB-affiliated minor leagues with teams in the United States and Canada was reduced to 11, with a total of 120 teams (four per each of the 30 MLB franchises).[1] There are also two affiliated rookie leagues based in the United States, with teams based at the parent clubs' spring training complexes in Arizona and Florida, an off-season autumn league, and one affiliated rookie league in the Dominican Republic. Additionally, four independent leagues are in association with MiLB.

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A Class A-Advanced California League game in San Jose, California, in 1994
Will Rhymes bats during a Class A game between the West Michigan Whitecaps and Kane County Cougars in September 2006
Coca-Cola Park in Allentown, Pennsylvania, home of the Lehigh Valley IronPigs, the Triple-A affiliate of the Philadelphia Phillies, in April 2009
A 2011 Double-A game between the Montgomery Biscuits and Carolina Mudcats at Five County Stadium in Zebulon, North Carolina in August 2011
Jake Thompson pitches for the GCL Tigers against the GCL Blue Jays in September 2012
Minor League mascots at a Pawtucket Red Sox Triple-A game in Pawtucket, Rhode Island in August 2016

As of the 2022 season, the minor league system is divided into four classes: Triple-A (AAA), Double-A (AA), High-A (A+), and Single-A (A).[a] Major League Baseball franchises may also maintain one or two complex-based rookie teams in the Arizona Complex League or Florida Complex League, and international summer baseball teams in the Dominican Summer League. While major league teams play a 162-game schedule, minor league seasons are shorter. As of 2022, a complete season in Triple-A is 150 games,[2] Double-A is 138 games, and High-A and Single-A are each 132 games.[3] In addition to the below organized leagues, the off-season Arizona Fall League has six teams that play approximately 30 games apiece in autumn and the rosters are made up of some of the best prospects associated with each of the six MLB divisions.


This classification currently includes two affiliated leagues: the 20-team International League and the 10-team Pacific Coast League, known as Triple-A East and Triple-A West, respectively, for the 2021 season.[4][5] For most of the 20th century, Triple-A also included the American Association, based in the Midwest, but that league disbanded with its clubs absorbed by the other two leagues, as part of a reorganization of the Triple-A level in 1997. The International League features teams from the Atlantic coast and midwestern U.S., while the Pacific Coast League features teams from the Pacific coast and the southwest.

Both young players and veterans play for Triple-A teams. Parent clubs often hold players who are on the 40-man roster, but not on the active MLB roster, at the Triple-A level. Such players are eligible to be added to a team's active major league roster. For teams in contention for a playoff spot late in a season, it gives them fresh players, while for teams not in contention, it gives them an opportunity to evaluate their second-tier players against major league competition.[6] Some Triple-A players are "career minor leaguers", former prospects whose skill growth has halted and who are not likely to advance to MLB, unless as a temporary replacement.[7]


There are currently three leagues in this classification: the 12-team Eastern League, known as Double-A Northeast for the 2021 season, with teams in the Northeast and Mid-Atlantic regions of the U.S., the eight-team Southern League (known as Double-A South for the 2021 season) with teams in the Deep South, and the 10-team Texas League (known as Double-A Central for the 2021 season) with teams in the Southwest and Great Plains.[5][8]

Some players jump to the majors from this level, as many of the top prospects are put here to play against each other rather than against minor and major league veterans in Triple-A.[7] A small handful of players might be placed here to start, usually veterans from foreign leagues with more experience in professional baseball. The expectation is usually that these veteran players will be in the majors by the end of the season, as their salaries tend to be higher than those of most prospects.


One level below Double-A is the High-A level, named "Class A-Advanced" before 2021. This classification has three leagues: the 12-team Midwest League, known as High-A Central for the 2021 season, covering the Midwest, the six-team Northwest League, known as High-A West for the 2021 season, with teams in the Pacific Northwest, and the 12-team South Atlantic League, known as High-A East for the 2021 season, with teams in the eastern states. All three leagues were reclassified prior to the 2021 season, with the Midwest League and the South Atlantic League promoted from Single-A and the Northwest League promoted from Class A Short Season.[9]

This level of play is often a second or third promotion for a minor league player, although some high first-round draftees, particularly those with experience playing college baseball, begin at this level.


Below the High-A level is Single-A, named "Class A" before 2021, when it was also known as Single-A or Full-Season A,[b] and "Low-A" for the 2021 season. This classification has three leagues: the 8-team California League, known as Low-A West for the 2021 season, located entirely in California, the 12-team Carolina League, known as Low-A East for the 2021 season, and the 10-team Florida State League, known as Low-A Southeast for the 2021 season. All three leagues were demoted from High-A to Single-A effective with the 2021 season.

These leagues are a mix of players moving up from Rookie leagues, as well as the occasional experienced first-year player. Most of the teams in the Florida State League are owned by major league parent clubs and use their spring training complexes.

In 2022, the official name of the class became Single-A.[10]


Minor leagues with the Rookie classification play a shortened season that traditionally began in mid-June and ended in late August or early September. This lowest level of minor league baseball consists of two US-based leagues, the Arizona Complex League and Florida Complex League, known as the Arizona League and Gulf Coast League, respectively, before 2021, and one Caribbean-based league, the Dominican Summer League.

The U.S.-based Rookie leagues play a schedule of approximately 60 games and are named "complex leagues" because games are played at their parent clubs' spring training complexes. Rosters consist primarily of newly drafted players who are not yet ready for a higher level of play. These leagues are intended almost exclusively to allow players to hone their skills; no admission is charged and no concessions are sold.

As of the 2024 season, the Arizona Complex League and Florida Complex League seasons commence in early May and conclude in late July in order to provide players with previous experience in the Dominican Summer League with a full season in stateside professional baseball without having to compete for playing time with newly drafted players selected in the July Major League Baseball draft.[11] This adjusted schedule also allows the top Rookie-level prospects in each organization to be promoted to class Single-A for the final two months of the professional baseball season upon the conclusion of the complex league seasons.

Roster sizes and player restrictions

As of the 2024 season, each major league club may have no more than 165 players assigned to the rosters of their domestic affiliates (i.e., Triple-A, Double-A, High-A, Single-A, and complex-league Rookie)—excluding international players assigned to the Dominican Summer League who have not yet been assigned to a domestic affiliate, as well as players placed on the minor league 60-day and full-season injured lists—during the minor league season, with a limit of 175 domestic players during the offseason.[12] During the minor league season, the following roster limits for each classification are used:

Rosters sizes in Minor League Baseball
Level Active roster size[13]: 10–11  Player restrictions[13]: 100 
Triple-A 28 players No restrictions
Double-A 28 players No restrictions
High-A 30 players No more than 2 players and 1 player-coach with
6 or more years of minor-league experience
Single-A 30 players No more than 2 players with
5 or more years of minor-league experience
No limit No more than 3 players with
4 or more years of minor-league experience
35 players No players with
4 or more years of minor-league experience

Leagues and affiliations

Minor leagues






Off-season leagues

Showcase league

Partner leagues

Major League affiliations

Table key
Triple-A Double-A High-A Single-A
IL International League EL Eastern League MWL Midwest League CAL California League
PCL Pacific Coast League SL Southern League NWL Northwest League CAR Carolina League
TL Texas League SAL South Atlantic League FSL Florida State League
Affiliations of Minor League teams with Major League teams
League Division MLB Team Triple-A Double-A High-A Single-A
American League East Baltimore Orioles Norfolk TidesIL Bowie BaysoxEL Aberdeen IronBirdsSAL Delmarva ShorebirdsCAR
Boston Red Sox Worcester Red SoxIL Portland Sea DogsEL Greenville DriveSAL Salem Red SoxCAR
New York Yankees Scranton/Wilkes-Barre RailRidersIL Somerset PatriotsEL Hudson Valley RenegadesSAL Tampa TarponsFSL
Tampa Bay Rays Durham BullsIL Montgomery BiscuitsSL Bowling Green Hot RodsSAL Charleston RiverDogsCAR
Toronto Blue Jays Buffalo BisonsIL New Hampshire Fisher CatsEL Vancouver CanadiansNWL Dunedin Blue JaysFSL
Central Chicago White Sox Charlotte KnightsIL Birmingham BaronsSL Winston-Salem DashSAL Kannapolis Cannon BallersCAR
Cleveland Guardians Columbus ClippersIL Akron RubberDucksEL Lake County CaptainsMWL Lynchburg HillcatsCAR
Detroit Tigers Toledo Mud HensIL Erie SeaWolvesEL West Michigan WhitecapsMWL Lakeland Flying TigersFSL
Kansas City Royals Omaha Storm ChasersIL Northwest Arkansas NaturalsTL Quad Cities River BanditsMWL Columbia FirefliesCAR
Minnesota Twins St. Paul SaintsIL Wichita Wind SurgeTL Cedar Rapids KernelsMWL Fort Myers Mighty MusselsFSL
West Houston Astros Sugar Land Space CowboysPCL Corpus Christi HooksTL Asheville TouristsSAL Fayetteville WoodpeckersCAR
Los Angeles Angels Salt Lake BeesPCL Rocket City Trash PandasSL Tri-City Dust DevilsNWL Inland Empire 66ersCAL
Oakland Athletics Las Vegas AviatorsPCL Midland RockHoundsTL Lansing LugnutsMWL Stockton PortsCAL
Seattle Mariners Tacoma RainiersPCL Arkansas TravelersTL Everett AquaSoxNWL Modesto NutsCAL
Texas Rangers Round Rock ExpressPCL Frisco RoughRidersTL Hickory CrawdadsSAL Down East Wood DucksCAR
National League East Atlanta Braves Gwinnett StripersIL Mississippi BravesSL Rome EmperorsSAL Augusta GreenJacketsCAR
Miami Marlins Jacksonville Jumbo ShrimpIL Pensacola Blue WahoosSL Beloit Sky CarpMWL Jupiter HammerheadsFSL
New York Mets Syracuse MetsIL Binghamton Rumble PoniesEL Brooklyn CyclonesSAL St. Lucie MetsFSL
Philadelphia Phillies Lehigh Valley IronPigsIL Reading Fightin PhilsEL Jersey Shore BlueClawsSAL Clearwater ThreshersFSL
Washington Nationals Rochester Red WingsIL Harrisburg SenatorsEL Wilmington Blue RocksSAL Fredericksburg NationalsCAR
Central Chicago Cubs Iowa CubsIL Tennessee SmokiesSL South Bend CubsMWL Myrtle Beach PelicansCAR
Cincinnati Reds Louisville BatsIL Chattanooga LookoutsSL Dayton DragonsMWL Daytona TortugasFSL
Milwaukee Brewers Nashville SoundsIL Biloxi ShuckersSL Wisconsin Timber RattlersMWL Carolina MudcatsCAR
Pittsburgh Pirates Indianapolis IndiansIL Altoona CurveEL Greensboro GrasshoppersSAL Bradenton MaraudersFSL
St. Louis Cardinals Memphis RedbirdsIL Springfield CardinalsTL Peoria ChiefsMWL Palm Beach CardinalsFSL
West Arizona Diamondbacks Reno AcesPCL Amarillo Sod PoodlesTL Hillsboro HopsNWL Visalia RawhideCAL
Colorado Rockies Albuquerque IsotopesPCL Hartford Yard GoatsEL Spokane IndiansNWL Fresno GrizzliesCAL
Los Angeles Dodgers Oklahoma City Baseball ClubPCL Tulsa DrillersTL Great Lakes LoonsMWL Rancho Cucamonga QuakesCAL
San Diego Padres El Paso ChihuahuasPCL San Antonio MissionsTL Fort Wayne TinCapsMWL Lake Elsinore StormCAL
San Francisco Giants Sacramento River CatsPCL Richmond Flying SquirrelsEL Eugene EmeraldsNWL San Jose GiantsCAL


Minor League Baseball is located in the United States
Current team locations:
  • International League
  • Pacific Coast League
  • Eastern League
  • Southern League
  • Texas League
  • Midwest League
  • Northwest League
  • South Atlantic League
  • California League
  • Carolina League
  • Florida State League

Team rosters

Early history

Joe DiMaggio during his time playing in the Pacific Coast League, c. 1930s
Patrick T. Powers, the first president of the National Association of Professional Base Ball Players
Jigger Statz played in over 2500 minor league games.

The earliest professional baseball league, the National Association of Professional Base Ball Players of 1871 to 1875, commonly referred to as the National Association,[c] comprised all fully professional teams. This system proved unworkable, however, as there was no way to ensure competitive balance, and financially unsound clubs often failed in midseason. This problem was solved in 1876 with the formation of the National League (NL), with a limited membership which excluded less competitive and financially weaker teams. Professional clubs outside the NL responded by forming regional associations of their own. There was a series of ad hoc groupings, such as the New England Association of 1877 and the Eastern Championship Association of 1881. These were loose groups of independent clubs which agreed to play a series of games over the course of one season for a championship pennant.

The first true minor league is traditionally considered to be the Northwestern League of 1883 to 1884.[14] Unlike the earlier minor associations, it was conceived as a permanent organization. It also, along with the NL and the American Association (AA), was a party to the National Agreement of 1883.[14] Included in this was the agreement to respect the reserve lists of clubs in each league.[14] Teams in the NL and the AA could only reserve players who had been paid at least $1,000. Northwestern League teams could reserve players paid $750, implicitly establishing the division into major and minor leagues. Over the next two decades, more minor leagues signed various versions of the National Agreement. Eventually, the minor leagues allied to negotiate jointly.

In the late 1890s, the Western League run by Ban Johnson decided to challenge the NL's position. In 1900, he changed the name of the league to the American League (AL) and vowed to make deals to sign contracts with players who were dissatisfied with the pay and terms of their deals with the NL. This led to a turf war that heated up in 1901 enough to concern Patrick T. Powers, president of the Eastern League, and many other minor league owners about the conflict potentially affecting their organizations. Representatives of the different minor leagues met at the Leland Hotel in Chicago on September 5, 1901.[15] In response to the NL–AL battle, they agreed to form the National Association of Professional Baseball Leagues (NAPBL), sometimes shortened to National Association (NA),[c] which would later adopt the trade name "Minor League Baseball".[16] The purpose of the NAPBL at the time was to maintain the independence of the leagues involved. Several did not sign the agreement and continued to work independently. Powers was made the first president of the NAPBL, whose offices were established in Auburn, New York.

In 1903, the conflict between the AL and NL ended in the National Agreement of 1903, which created the National Baseball Commission to oversee the major and minor leagues.[17] The NAPBL became involved in the later stages of the negotiations to develop rules for the acquisition of players from their leagues by the NL and the AL. The 1903 agreement ensured that teams would be compensated for the players that they had taken the time and effort to scout and develop, and no NA team was required to sell their players, although most did because the cash was an important source of revenue for most teams. The NA leagues were still fiercely independent, and the term minor was seldom used in reference to them, save by the major-market sportswriters. Sports news, like most news generally, often did not travel far in the days before radio and television, so, while the leagues often bristled at the major market writers' descriptions, they viewed themselves as independent sports businesses. Many baseball writers of that time regarded the greatest players of the minor leagues, such as Buzz Arlett, Jigger Statz, Ike Boone, Buddy Ryan, Earl Rapp, and Frank Shellenback, as comparable to major league players. Leagues in the NA would not be truly called minor until Branch Rickey developed the first modern farm system in the 1930s. The Commissioner of Baseball, Kenesaw Mountain Landis fought Rickey's scheme, but, ultimately, the Great Depression drove teams to establish systems like Rickey's to ensure a steady supply of players, as many NA and independent teams could not afford to keep their doors open without the patronage of Major League Baseball. The leagues of the NA became subordinate to the major leagues, creating the first minor leagues in the current sense of the term. Other than the Pacific Coast League (PCL), which under its president Pants Rowland tried to become a third major league in the Western states, the other leagues maintained autonomy in name only, being totally economically dependent upon the AL and NL.

In 1922, the United States Supreme Court decision Federal Baseball Club v. National League (259 U.S. 200), which grants baseball a special immunity from antitrust laws, had a major effect on the minor leagues. The special immunity meant that the AL and NL could dictate terms under which every independent league did business. By 1925, major league baseball established a flat-fee purchase amount of $5,000 for the contract of any player from an NA member league team. This measure was leveled primarily at the Baltimore Orioles, then a Triple-A team that had dominated the minors by keeping players longer than many competitors, allowing the players to more fully develop, driving up their sale value to major-league teams and giving Baltimore a talent advantage. Deprived of this option by the flat-fee policy, minor league teams had little choice but to sell players as soon as they drew major-league interest.

Classification history

19th century

The earliest classifications used in the minor leagues began circa 1890, for teams that were party to the National Agreement of 1883.[18]: 15  The different levels represented different levels of protection for player contracts and reserve clauses:[18]: 15 

  • Class A: contracts and reserve lists protected
  • Class B: contracts and reserve lists protected, but a major league team could draft a player for a set price
  • Class C: contracts protected
  • Class D: contracts protected, but any higher class could draft a player for a set price
  • Class E/F: no protection

20th century

After the National Association of Professional Baseball Leagues was founded in 1901, classifications were redefined:[19][20][21]

Class Aggregate population of
cities in the league
Salary cap
(per month)
team / player
Draft fee† Protection fee‡
Class A more than 1 million $1800 / $175 n/a $50
Class B 400,001 to 1 million $1000 / $125 $300 $30
Class C 200,001 to 400,000 $800 / $100 $200 $20
Class D up to 200,000 $700 / $75 $100 $10

† Draft fee set an amount for a team in a higher class to select a player; n/a for Class A as it would be up to each team to negotiate with an interested major league club.
‡ Protection fee reserved a player to a team, even after a contract expired, preventing the player for seeking employment with any other team.

All minor leagues were classified,[18]: 15  and had the following assignments entering the 1902 season:[18]: 187–189 

Additional classifications added prior to World War II included:[18]: 15–16 

  • Class AA ("Double-A"): added in 1912 as the new highest level.[22] Double-A remained the highest level through 1945.
  • Class A1: added in 1936, between Class A and Class AA.[23] Two Class A circuits, the Texas League and the Southern Association, were upgraded to A1 to signify their continued status as one step below the highest classification, then Double-A, and a notch above their former Class A peers, the New York–Pennsylvania League and Western League.[23] Class A1 remained in use through 1945.
  • Class E: added in 1937, as the new lowest level, for players with no professional experience in Class D or higher.[23] The only Class E league that existed was the four-team Twin Ports League, which operated for less than a full season in 1943.[23]

Postwar changes

Jackie Robinson with the Triple-A Montreal Royals in July 1946

In 1946, with the minor leagues poised for unprecedented growth, the higher-level classifications were changed. Class AAA ("Triple-A") was created and the three Double-A circuits (the Pacific Coast League, International League, and the American Association) were reclassified into Triple-A.[18]: 15  Class A1 (comprising the Texas League, which had last operated in 1942, and the Southern Association) became Class AA.[18]: 15  Class A remained the third-highest classification, with lower levels still ranked Class B through Class D in descending order, with Class D being the equivalent of later Rookie leagues. The impact of the Korean War in 1950 caused a player shortage in many cities below Class B.

In 1952, the "Open" classification was created.[24] The Pacific Coast League (PCL), which had been rated Triple-A since 1946, was the only minor league to obtain this classification, which it held through 1957.[25] At this time, the major leagues only extended as far west as St. Louis, Missouri, and as far south as Washington, D.C. This classification severely restricted the rights of the major leagues to draft players out of the PCL, and at the time it seemed like the PCL would eventually become a third major league.[24] The PCL would revert to Triple-A in 1958,[26] due to increasing television coverage of major league games and in light of the Dodgers and Giants moving to Los Angeles and San Francisco, respectively.[25]

Reorganization of 1963

A significant reorganization of the minor leagues took place in 1963, caused by the contraction of clubs and leagues during the 1950s and early 1960s. In 1949, the peak of the postwar minor league baseball boom, 448 teams in 59 leagues were members of the National Association of Professional Baseball Leagues, with the number of teams falling to 324 in 1952, and 243 in 1955.[27][28] By the end of 1963, only 15 leagues above Rookie-level survived in the United States and Canada.[18]: 525–527 

After the 1962 season, the Triple-A American Association—which had lost key markets such as Milwaukee, Kansas City, Minneapolis–Saint Paul and Houston to the Major Leagues since 1953—disbanded. The surviving International and Pacific Coast leagues absorbed the four remaining American Association franchises. Meanwhile, at the Double-A level and below there were even more significant changes:

Designations below Class A disappeared because the lower levels could not sustain operation during a large downturn in the financial fortunes of minor league baseball, due to factors including the rise of television broadcasts of major league sports across broad regions of the country. As part of the 1963 reorganization, Major League clubs increased their commitments to affiliate with minor league teams through Player Development Contracts, outright ownerships, or shared affiliations and co-op arrangements.[29]

Further changes after 1963

The minor league system that evolved following the 1963 reorganization remained in place through 2020, categorizing leagues into one of six classes: Triple-A (AAA), Double-A (AA), Class A-Advanced (High A or A+), Class A (Low A), Class A Short Season, and Rookie. Furthermore, Rookie was further informally subdivided into Rookie Advanced, complex-based Rookie, and international summer baseball.

  • Triple-A: The American Association was revived as a Triple-A league in 1969 and flourished with the minor league baseball boom of the 1980s and 1990s. However, all of its teams were again absorbed into the International and Pacific Coast leagues in 1998 as part of a sweeping reorganization of the minors' top classification. The American Association and the International League also played an interlocking schedule during the late 1980s as part of the Triple-A Alliance. The Mexican League was upgraded from Double-A to Triple-A in 1967.
  • Double-A: In 1964, the South Atlantic League changed its name to Southern League. In 1971, because of continued contraction (and Major League expansion) that left each circuit with only seven teams, the Texas League and Southern League formed the 14-team Dixie Association. The arrangement lasted only for that season, and the records and history of the constituent leagues were kept distinct. In 1972, each league added an eighth team, rebalancing their schedules. The leagues subsequently returned to prosperity with the revival of minor league baseball that began in the 1980s.
  • Class A: In 1980, the Western Carolinas League changed its name, reviving the historic South Atlantic ("Sally") League moniker. Additionally, over time, two more classifications evolved from Class A. Under the rules governing the affiliated minor leagues,[30]: 158–159  these became separate classifications, despite the similarity in name:
    • Beginning in 1965, Class A Short Season leagues played approximately 75 to 80 games per season, starting in mid-June and ending in early September, designed to allow college players to complete their college seasons in the spring, be selected in the MLB draft in June, signed, and then immediately placed in a competitive league. The classification was eliminated prior to the 2021 season, with the New York–Penn League and Northwest League as the only active leagues at this level.
    • The Class A-Advanced classification, one rung below Double-A, was introduced in 1990 for the California League, Carolina League, and Florida State League, splitting the Class A level even further.[25] Entering the 2021 season, three new "High-A" leagues were introduced in replacement of prior leagues at this level.
  • Rookie Advanced: The Appalachian League and Pioneer League were classified as Rookie Advanced leagues beginning in 1991.[31][32] The players in these leagues were thought to be further along in their development than players in the pure Rookie leagues, and hence games were more competitive. Teams in these leagues were allowed to sell concessions and charge admission. In practice, many major league teams would have either one affiliate at this level or one affiliate in Class A Short Season but not both, making them de facto equivalent. The Rookie Advanced classification was eliminated prior to the 2021 season.
  • Rookie: In 1964, the Pioneer League stepped down from Class A to Rookie league status, and the first "complex-based" leagues, the Sarasota Rookie League and the Cocoa Rookie League, made their debuts. The Sarasota Rookie League underwent a name change to the Florida Rookie League in 1965 before becoming the Gulf Coast League the next season. The Cocoa Rookie League lasted only one season, and the Florida East Coast League of 1972, based in the same region of the state, also existed for only one year. In 1989, a counterpart to the Gulf Coast League, the Arizona League, made its debut and it continues to operate as a Rookie-level league for MLB teams with spring training facilities based in Arizona.

There have also been some failed start-up leagues. During the 1970s, three official minor leagues (members of NAPBL) attempted unsuccessfully to revive unaffiliated baseball (teams not associated with specific MLB franchises) within the organized baseball structure. These were the Class A Gulf States League (1976) and Lone Star League (1977), and the Triple-A Inter–American League (1979). None lasted more than a full season.

Reorganization of 2021

Rob Manfred

In October 2019, Baseball America reported that Major League Baseball had proposed dramatic changes to MiLB that would take effect after expiration of the Professional Baseball Agreement, which governed the MLB–MiLB relationship, at the end of the 2020 season. This included the elimination of many minor league teams.[33][34]

In mid-November 2019, more than 100 members of the United States Congress signed a letter sent to Commissioner of Baseball Rob Manfred opposing the proposal, noting that it "is not in the best interest of the overall game of baseball" and that it would "devastate our communities, their bond purchasers and other stakeholders affected by the potential loss of these clubs."[35] A response from MLB highlighted that the proposal aims to improve player travel and working conditions.[35]

On November 21, 2019, Minor League Baseball released a statement, asserting that it is "unnecessary and unacceptable to wipe out one-quarter of minor league teams" and characterized the proposal as a way "to improve the profitability of MLB".[36] Manfred rebuked Minor League Baseball for releasing the negotiations to the public and threatened to cut ties with MiLB altogether.[37]

The following changes, which represent the first significant overhaul of minor league classifications since 1963, have since been implemented:

Affiliate invites for 2021

When MLB teams announced their affiliates for the 2021 season on December 9, 2020, each of the 30 MLB teams had one affiliate at four levels—Triple-A, Double-A, High-A, and Low-A—for a total of 120 affiliated teams.[1] Approximately 40 teams lost their MLB affiliations; the Fresno Grizzlies were demoted from Triple-A to Low-A; and the majority of surviving clubs at High-A and Low-A swapped levels, with the former Florida State League and California League dropped down nearly as intact units and the Northwest League and Midwest League promoted with 75% of their teams. The Carolina League dropped to Low-A with seven of its ten teams and added five from the old South Atlantic League in trade; the SAL in turn moved to High-A with half of its previous 12-team roster, filling it out with two Carolina League High-A holdovers, one Midwest League returnee, and three formerly short-season New York-Penn League promotees.[1][42]

League realignment

On February 12, 2021, Major League Baseball announced new league alignments for all 120 affiliated Minor League Baseball clubs effective as of the 2021 season.[43] Contrary to previously published reports indicating that realignment would retain the names of the existing minor leagues, Major League Baseball elected to abandon the names of existing minor leagues in favor of a new, class- and region-based naming system.[44]

Triple-A was divided into two leagues:

  • Triple-A East, consisting of 20 teams aligned into three divisions (Midwest, Northeast, and Southeast).
  • Triple-A West, consisting of 10 teams aligned into two divisions (East and West).

Double-A was divided into three leagues:

  • Double-A Central, consisting of 10 teams aligned into two divisions (North and South).
  • Double-A Northeast, consisting of 12 teams aligned into two divisions (Northeast and Southeast)
  • Double-A South, consisting of eight teams aligned into two divisions (North and South).

High-A (formerly Class A-Advanced) was divided into three leagues:

  • High-A Central, consisting of 12 teams aligned into two divisions (East and West).
  • High-A East, consisting of 12 teams aligned into two divisions (North and South).
  • High-A West, consisting of six teams without divisional alignment.

Low-A (formerly Class A) was divided into three leagues:

  • Low-A East, consisting of 12 teams aligned into three divisions (Central, North, and South).
  • Low-A Southeast, consisting of 10 teams aligned into two divisions (East and West).
  • Low-A West, consisting of eight teams aligned into two divisions (North and South).

The US-based Rookie-level leagues were renamed prior to starting play in late June; the former Gulf Coast League was renamed as the Florida Complex League and the former Arizona League was renamed as the Arizona Complex League.[45][46]

On March 16, 2022, Minor League Baseball announced that the historic league names were acquired by MLB. The region-based names were scrapped and the previous league names given to the new leagues that most closely resembled the old leagues.

  • Triple-A East became the International League
  • Triple-A West became the Pacific Coast League
  • Double-A Central became the Texas League
  • Double-A Northeast became the Eastern League
  • Double-A South became the Southern League
  • High-A Central became the Midwest League
  • High-A East became the South Atlantic League
  • High-A West became the Northwest League
  • Low-A East became the Carolina League
  • Low-A Southeast became the Florida State League
  • Low-A West became the California League

The Low-A classification was also renamed Single-A.[47] Additionally, the International League was reorganized from three divisions to two: East and West.

Classification hierarchy

The following classifications, listed from highest to lowest, have existed since the National Association of Professional Baseball Leagues (the formal name of Minor League Baseball) was established prior to the 1902 season. Only seasons where a change was made to the hierarchy are listed; class introductions after 1902 appear in bold font, while class eliminations appear in italics. Not all defined classifications were used each season.

1902 1912 1936 1937 1946 1952 1958 1963 1965 1990 1991 2021
  • A
  • B
  • C
  • D
  • AA
  • A
  • B
  • C
  • D
  • AA
  • A1
  • A
  • B
  • C
  • D
  • AA
  • A1
  • A
  • B
  • C
  • D
  • E
  • AAA
  • AA
  • A
  • B
  • C
  • D
  • Open
  • AAA
  • AA
  • A
  • B
  • C
  • D
  • AAA
  • AA
  • A
  • B
  • C
  • D
  • AAA
  • AA
  • A
  • Rk
  • AAA
  • AA
  • A
  • A (Short)
  • Rk
  • AAA
  • AA
  • A-Adv
  • A
  • A (Short)
  • Rk
  • AAA
  • AA
  • A-Adv
  • A
  • A (Short)
  • Rk-Adv
  • Rk
  • AAA
  • AA
  • High-A
  • A
  • Rk
  • A1
  • E
  • Open
  • B
  • C
  • D
  • A (Short)
  • Rk-Adv


  • High-A was formerly Class A-Advanced (A-Adv) before 2021
  • Class A was officially known as Low-A during the 2021 season
  • A (Short) denotes Class A Short Season
  • Rk-Adv denotes Rookie Advanced
  • Rk denotes Rookie


Players of the Double-A Springfield Cardinals in July 2017

Major league clubs may only use players who are on the team's major league active roster in games; players on the active roster are selected from a 40-man major league reserve list (often called the 40-man roster). Effective with the 2020 Major League Baseball season, the active roster size for each team is 26 players for regular games and 27 players for scheduled doubleheaders, with the roster size expanding to 28 players from September 1 through the end of the regular season.[48] Prior to the 2020 season, the active roster size from the start of the regular season until September 1 was 25 players, with a 26th player allowed for a scheduled doubleheader.[49] From September 1 to the end of the regular season, teams were allowed to expand their active rosters up to 40 players, the size of the major league reserve list.

Players on the 40-man reserve list who are not on the team's active roster are generally either on the injured list or playing at some level of the minor leagues (usually at the Triple-A or Double-A level). Players on the 40-man reserve list are eligible for membership in the Major League Baseball Players Association. These minor league players work at the lower end of major league pay scales and are covered by all rules and player agreements of the players association. Minor league players not on the 40-man reserve list are under contract to their respective parent Major League Baseball clubs. Until September 2022, they did not have union representation, but they joined the MLBPA following a majority of minor leaguer players expressing support.[50] They generally work for far less pay as they develop their skills and work their way up the ladder toward the major leagues.[51] Many players have signing bonuses and other additional compensation that can run into the millions of dollars, although that is generally reserved for early-round draft picks.

A major league team's director of player development determines where a given player will be placed in the farm system, in coordination with the coaches and managers who evaluate their talent. At the end of spring training, players both from the spring major camp and minor league winter camp are placed by the major league club on the roster of a minor league team. The director of player development and the general manager usually determine the initial assignments for new draftees, who typically begin playing professionally in June after they have been signed to contracts. The farm system is ever-changing, and the evaluation of players is a constantly ongoing process. The director of player development and his managers meet or teleconference regularly to discuss how players are performing at each level. Personal development, injuries, and high levels of achievement by players in the classes below all steer a player's movement up and down in the class system.

Players will play for the team to which they are assigned for the duration of that season unless they are "called up" (promoted to a higher level), "sent down" (demoted to a lower-class team in the major league club's farm system), or released from the farm system entirely. A release from minor-league level used to spell the end of a minor league player's career. In more modern times, released players often sign with independent baseball clubs, which are scouted heavily by major league organizations. Many players get a second or third look from the major league scouts if they improve in the independent leagues.

Minor league salaries vary based on class level and length of season; however, the majority of players make less than $10,000 per season.[52] Although not playing at the major league level, minor league players are professional athletes. Minor league players often colloquially refer to the major leagues as "The Show".

Rehabilitation assignments

C C Sabathia of the New York Yankees with the Trenton Thunder in July 2014

Rehabilitating with Minor League teams is a standard way for injured Major League players to get back into playing shape.[53]

Players on the injured list (IL) can be sent to the minor leagues to aid in rehabilitation following an injury, typically for one or two weeks. Players are often sent to minor league clubs based on geography and facilities, not necessarily by class for these reassignments.

Rehabbing major leaguers continue to receive Major League pay and generally enjoy better amenities than their minor league teammates.[53]

Former Minnesota Twins star Joe Mauer, who missed most of the first two months of the 2011 season due to a difficult recovery from arthroscopic knee surgery after the 2010 season, reported to Minnesota's Class A-Advanced Florida State League team, the Fort Myers Miracle, which is based in their spring training facility in Fort Myers. The Miracle manager at the time was Mauer's older brother Jake.[54]

Mike Trout's first rehab assignment of his career, in July 2017, was with the Inland Empire 66ers of San Bernardino, California, the Class A-Advanced affiliate of the Los Angeles Angels. This allowed Trout to stay closer to the Angels compared to the team's Triple-A affiliate, the Salt Lake Bees.[55]


Ryan Blakney (left) and Ben May umpiring in the Midwest League in 2008

Umpires at the minor league level are overseen by Minor League Baseball Umpire Development (MiLBUD), which is responsible for the training, evaluation, and recommendation for promotion and retention or release of the umpires.[56]

The umpires are evaluated eight times a season by the staff of MiLBUD and receive a ranking at mid-season and the end of each year. Based on performance during the year, an umpire may advance in classification when a position opens in-season or during the off-season. MiLBUD holds an annual Rookie Evaluation Course every year in March to evaluate rookie umpires. Participants are normally the best students from the two professional umpire schools (one owned and operated by the same entity). The top students who pass the evaluation course are recommended for the first openings in lower-level leagues.[57]

Any student who wants to work as an umpire must attend a professional umpire training school. Minor League Baseball recognizes two schools for training prospective professional umpires, the Harry Wendelstedt Umpire School and Minor League Baseball Umpire Training Academy, both located in Florida. The Umpire Training Academy is owned and operated by MiLBUD, while the Wendelstedt Umpire School is independently owned by MLB umpire Hunter Wendelstedt. The classes for each school are held for five weeks in January and February. The instructors at these schools are former or present major or minor league umpires. Simply attending one of these schools, however, does not guarantee that the candidate will be recommended to the evaluation course or for openings in lower-level leagues. Generally, less than 20% of students move on to the Rookie Evaluation Course.[58]

Before a development program was created, minor league presidents would recruit directly from umpire schools. Umpires were then "sold" from league to league by word of mouth through the various league presidents.[59] The umpire development program first started in 1964, when it was decided that a method of recruitment, training, and development for umpires of both major and minor leagues was needed. The program was founded at baseball's 1964 Winter Meetings in Houston, and it began operating the next year. The program aimed to recruit more athletic, energetic, and dedicated individuals who would also have high morals and integrity standards. In 1968, it was decided that the program needed its own umpire training course, which would be held annually. The first "Umpire Specialization Course" was held in St. Petersburg, Florida, the following year.[60]

Minor league umpires have been unionized since 1999, when they formed the Association of Minor League Umpires (AMLU),[61] which has been a guild within the Office and Professional Employees International Union (OPEIU) since 2010.[62] A strike action occurred at the start of the 2006 season,[63] spurred by a disagreement over salaries and resulting in the use of replacement umpires until an agreement was reached after two months.[64]

Presently, the candidates for a job in professional umpiring must meet several requirements in order to be considered. An applicant must have a high school diploma or a G.E.D., must be athletic, and also must have 20/20 vision, although they are permitted to wear glasses or contact lenses.[65] They must also have good communication skills, good reflexes and coordination, and must have trained at one of the two professional umpire schools.


The 2011 Omaha Storm Chasers, the Pacific Coast League champions

Teams in the affiliated minor leagues are generally independently owned and operated, and are directly affiliated with one major league team. Affiliations are governed by standardized agreements; historically known as a Player Development Contract (PDC),[30]: 185  as of 2021 the term Player Development License Agreement (PDL) is used.[13]: 3  Some minor league teams are directly owned by their major league parent club, such as all of the New York Mets' affiliates except the Binghamton Rumble Ponies.

With the reorganization of 2021, the standard length of an affiliation agreement is 10 years.[66] Previously, affiliations were for only two or four years,[67] with affiliation changes being fairly frequent, though many relationships have been renewed and endure for extended time periods. For example, the Omaha Storm Chasers (formerly the Omaha Royals and Omaha Golden Spikes) have been the Triple-A affiliate of the Kansas City Royals since the Royals joined the American League in 1969, but the Columbus Clippers, having been affiliated with the New York Yankees since 1979, changed affiliations to the Washington Nationals in 2007, and again changed to the Cleveland Indians two years later in 2009.

Generally, the parent major league club pays the salaries and benefits of uniformed personnel (players and coaches) and provides bats and balls, while the minor league club pays for in-season travel and other operational expenses.[68]

The longest continuous affiliations are between the Philadelphia Phillies and their Double-A affiliate, the Reading Fightin Phils and between the Detroit Tigers and their Low-A affiliate, the Lakeland Flying Tigers, both of which date to 1965. Both Reading and Lakeland are now owned outright by their parent major league clubs.


The former headquarters of Minor League Baseball in St. Petersburg, Florida; the league is now based in New York City

Minor League Baseball was governed through a centralized office until the restructuring of the minor leagues in 2021, with Major League Baseball itself now handling "all issues related to governance, scheduling, umpiring, license compliance, and other league administration functions."[3] Minor league headquarters were located in St. Petersburg, Florida, from 1973 onward.[69] As of 2009, Minor League Baseball had 27 employees in St. Petersburg.[69] Before coming under the direct control of MLB, 11 people served as president of Minor League Baseball:[70]

Independent baseball

Haymarket Park, home to the Lincoln Saltdogs, an independent baseball team in Lincoln, Nebraska

Independent leagues are those professional leagues in the United States and Canada not under the purview of organized Minor League Baseball and the Commissioner of Baseball. Independent baseball existed in the early 20th century and has become prominent again since 1993.[71]

Leagues operated mostly autonomously before 1902, when the majority joined the NAPBL. From then until 1915, a total of eight new and existing leagues remained independent. Most joined the National Association after one season of independence. Notable exceptions were the California League, which was independent in 1902 and from 1907 to 1909; the United States Baseball League, which folded during its independent 1912 season; and the Colonial League, a National Association Member that went independent in 1915 and then folded.[72] Another independent league, the Federal League, played at a level considered major league from 1914 to 1915.[73]

Few independent leagues existed between 1915 and 1993. Major exceptions included the Carolina League and the Quebec-based Provincial League. The Carolina League, based in the North Carolina Piedmont region, gained a reputation as a notorious "outlaw league" during its existence from 1936 to 1938.[74] The Provincial League fielded six teams across Quebec and was independent from 1948 to 1949. Similarly to early 20th-century independent leagues, it joined the National Association in 1950, playing for six more years.[72][75]

Independent leagues saw new growth after 1992, after the new Professional Baseball Agreement in organized baseball instituted more stringent revenue and stadium requirements on members.[76] Over the next eight years, at least 16 independent leagues formed, of which six existed in 2002.[72] As of the 2024 season, there are seven active leagues, with four of them acting as MLB Partner Leagues.


MiLBY Awards

The MiLBY Awards (formerly "This Year in Minor League Baseball Awards") are given in nine categories. In five categories (Best Starter, Best Hitter, Best Reliever, Best Game, and Best Team), winners are selected at each level of Minor League Baseball above Rookie league. In three categories (Play of the Year, Moment of the Year, and Homer of the Year), one overall winner is chosen for all of Minor League Baseball. In the remaining category (Promo of the Year), there are overall winners in each of five subcategories: Best Promotion (of all types), Best Theme Night, Best Giveaway, Best Celebrity Appearance, and Best Miscellaneous Promotion.

Other player awards

Major awards

Warren Giles, namesake of the league president annual award
  • Organization of the Year Award (formerly the John H. Johnson President's Award) (1974) – given each year, MiLB's top award recognizes "the complete baseball franchise—based on franchise stability, contributions to league stability, contributions to baseball in the community, and promotion of the baseball industry."[79][80][81]
  • Rawlings Woman Executive of the Year (1976) – given each year to a woman in MiLB for exceptional contributions to her club, her league, or baseball.[79][82]
  • Warren Giles Award (1984) – given each year to a league president for outstanding service.[79][82][83]
  • King of Baseball (1951) – given annually in recognition of longtime dedication and service to professional baseball.[79]
  • Larry MacPhail Award (1966–2019) – given annually in recognition of team promotions.[79][84]
  • Sheldon "Chief" Bender Award (2008) – given to a person with distinguished service who has been instrumental in player development.[79]
  • Mike Coolbaugh Award (2008) – given to someone who has shown an outstanding baseball work ethic, knowledge of the game, and skill in mentoring young players on the field.[79]
  • John H. Moss Community Service Award (2013) – given to a team to recognize outstanding charitable service, support, and leadership.[79]
  • Charles K. Murphy Patriot Award (2016) – given to an individual or team to recognize outstanding support of and engagement with the United States Armed Forces and veterans.[79]

Top 100 teams

During its centennial celebration in 2001, Minor League Baseball compiled a list of the 100 best minor-league baseball teams of the century.[85]



Nearly every minor-league team has its own local radio contract, though unlike their major-league counterparts, these generally consist of only one or two individual stations.

Also see: Sports radio networks in the United States (MiLB is a sub-template).


Nationally, Minor League Baseball games air on Stadium[86] and MLB Network.[87]

Many individual teams have contracts with local television channels. For example, the Triple-A Indianapolis Indians have a contract with WISH-TV to air 35 home games during the 2021 season.[88]

Streaming media

MiLB.TV is the minor leagues' online video streaming service, in the vein of Major League Baseball's Entering the 2021 season, the subscription service offers games for all Triple-A and Double-A teams, and select games from other classifications.[89]

TuneIn has provided free audio streams to minor league games, accessible through the MiLB.TV website.[90]

See also


  1. ^ Sites such as use the AAA, AA, A+, and A abbreviations in player records; A− is used for the now defunct Class A Short Season. A+ and A− are written abbreviations only; the levels are not called "A-plus" or "A-minus".
  2. ^ "Full-Season A" and "Short-Season A" were used to clearly differentiate Class A from Class A Short Season.
  3. ^ a b The "National Association" of 1871–1875 is not to be confused with the "National Association" formed in 1901 that came to be known as Minor League Baseball.


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External links

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