Club rosters will be composed of a minimum of 22 active players and a maximum of 24 active players.
Beginning with the 2011 season, the following rules shall apply:
Each club must carry a minimum of eleven (11) rookies (combination of R1 and R2 players) with no professional experience other than specified below and may carry a maximum of thirteen (13) players with unlimited professional experience.
No player or player/coach may have attained twenty seven (27) years of age prior to January 1 of that playing season with the exception of one player who will be designated as a “Veteran” player who may have attained thirty (30) years of age prior to January 1 of that playing season provided that he meets the qualifications listed below.
For the 2013 season, players must have been born on or after January 1, 1986 to be eligible, aside from the Veteran classification player (one per team) who must have been born on or after January 1, 1983.
Rookie Classification: The Rookie classification will be split into two sub-classifications, Rookie 1 and Rookie 2. The Rookie 1 sub-classification will be for players who made their professional debut in the current season and therefore have no prior professional experience. The Rookie 2 sub-classification will be for players who held the rookie 1 sub-classification in the previous year in the Frontier League (regardless of the number of at bats, innings pitched, or pitching appearances) or began their professional career during the 2012 season.
Experienced Classification: The Experienced classification is for all players who do not meet the requirements to be classified under the Rookie or Veteran classifications.
Veteran Classification: The Veteran classification is for a player who is over twenty seven (27) years of age but has not attained thirty (30) years of age prior to January 1 of that playing season. The player must have been listed on a Frontier League active roster or injured list for a total of one hundred (100) regular season games combined during the previous two (2) seasons.
21-year old exemption: Any player who is twenty-one (21) years of age or younger on or after January 1st of any season and is entering his first year in the Frontier League, regardless of any prior professional baseball experience, will be considered no higher than a Rookie-2 by Frontier League Rules. For the 2013 season, a birthdate of January 1, 1991 will be the cutoff to qualify under this provision.