11U - Mosquito Division Overview


At the Mosquito level, base paths are set at 60 feet and a regulation hard ball is used. No lead offs are allowed and players cannot steal until the ball crosses the plate. “Live” pitching is used throughout the 6 inning games. A 1st year pitcher (or pitchers) must pitch the first 2 innings per game. Pitching limits follow the LMBA and BC Minor pitching rules. Mosquito is a “House” league.

General Rules

U11 Spring Rules – Updated 2022

  1. All BC Minor Baseball rules will be in effect but LMBA rules take precedence.
  2. Game length is two (2) hours after the schedule start time. No inning to start later than one hour and forty five minutes after the actual game start time, if there is another game scheduled afterwards, or if the umpire decides it is too dark to play safely.  The game may be called (Umpire’s decision), and game score reverts back to the previous completed inning played.  If the home team is at bat and the time passes the two (2) hour mark, the inning should be completed if possible (Umpire’s decision).
  3. For the first two (2) innings of a game a half inning will end when either two (2) runs are scored or three (3) outs occur. For innings three (3) through five (5) a half inning will end when either four (4) runs are scored or three (3) outs occur. The six (6) or last lining will be declared open by the umpire and will only end when three (3) outs occur or the mercy rule takes effect.
  4. Ten (10) run mercy rule is in effect after 5 or more innings (4 1⁄2 innings if home team is leading).
  5. Games are not to be postponed or rescheduled without the agreement of the head coaches and the division manager. Teams are not to consider a game canceled due to bad weather unless they are officially notified. . Minimum game cancellation notification time is 1 ¾ hours before game time start.
  6. The home team is responsible for notifying the umpire allocator, concession manager, and the division manager of any game cancellations, postponements, or re-scheduling.
  7. Coaches are responsible for the behaviour of their team players, fans and parents during games and to make sure there is no abuse of umpires or the equipment. INAPPROPRIATE LANGUAGE AND BEHAVIOUR WILL NOT BE TOLERATED. An umpire may direct a coach to deal with (a) fan(s) that they believe are being inappropriate. It is the responsibility of the coach to notify the division manager of any issues that occur at the ballpark immediately following the game and/ or practice
  8. Spring Season jerseys and hats that are supplied by the league must be worn to all games. Shirts are to be tucked in and players are to wear grey baseball pants. NO summer ball/ all star gear is to be worn during spring league play. It is mandatory that all players wear athletic supporters. Players are to wear rubber cleats; metal cleats are not allowed.
  9. As per BC Minor Rule 19.02 Helmets - batters, on deck batters, players used as base coaches, or batboys in all age categories shall wear double earflap helmets which give protection to the temple, ears, base of skull, and top of the hat. Skull caps and wraparound headgear are not to be used by any player as so defined. For divisions 13U and younger all player helmets, must have a chinstrap or have been manufactured with a c-flap (chin protector) and not contain the snaps for a chin strap.
  10. All players, coaches and team managers are not permitted to wear any clothing other than described in the following articles for games. All other divisions – Conventional baseball uniforms including a shirt, pants, and socks. Coaches must wear at least a team cap in Spring season play. Managers or coaches occupying a coach’s box, must be dressed in full uniform except that they will be allowed to wear matching pullovers, cage jackets or warm-up jackets and colour coordinated long pants. NO SHORTS, NO SLEEVELESS SHIRTS AND NO CUT OUT SLEEVES JERSEY. Coaches and Managers found not to be adhering with this rule will not be allowed on the field during the game(This is rule 19.06 of the BC Minor Rule Book)
  11. Each team is responsible for cleaning up their dugout area after their games and practices.
  12. The home team is responsible for preparing the diamond by lining the field and filling in any depressions before the game. After the game, they are to make sure all equipment used during the game is returned to the bins and locked up. No children are allowed in the equipment room or bins.
  13. Equipment is NOT to be used for any activity that is not an LMBA sanctioned event. Only the coaches and the executive will be given access to the equipment boxes. A league provided hardball is used during gameplay. The home team is responsible for providing the game ball.
  14. The baseball field is the area enclosed within the baseball fence. Anything within this playing area is “in-bounds”; anything outside of the fenced area is considered to be “out of bounds” or “dead ball territory”.
  15. The infield is considered to be the dirt area of the field. An infield player is a player whose position is based in the infield. The outfield is considered to be the grass area of the field. An outfield player is a player whose position is based in the outfield. Outfield players must start in the outfield but can come into the infield to make a play.
  16. The first base and third base lines extend from home plate all the way to the outfield fence. These lines determine if a hit is fair or foul. The area between (and including) the foul lines is fair territory, while anything outside them is foul.
  17. Base paths are set at 60 feet. The distance between home plate and the pitchers rubber is 46 feet.
  18. Each team is allowed a maximum of three (3) coaches, inside the fenced perimeter, once game play commences. Coaches must remain in the dugout area unless their team is on the offence and they are occupying a coaches box. This is out of respect for the other team and their coaches.
  19. Each team may have an unlimited amount of coaches; however, only the Head Coach and First Assistant (recorded by the LMBA) will be exempt from completing further volunteer hours.
  20. Only those individuals who have completed their Criminal Record Check and have registered as a helper are permitted to work with the players on the field.
  21. The head coach will meet with the opposing coach and the umpires at home plate 5 minutes prior to the scheduled game time. The coaches will introduce themselves by their first name to the umpires and will present the team lineup sheet/batting order (2 copies) to the home plate umpire. The home team will give their lineup sheets to the umpire first.
  22. Coaches and/or Players may NOT:
    1. Argue any umpire’s decision. The umpire’s call is final
    2. Approach an Umpire during or after a game at any time.
    3. Harass or verbally abuse any official on the field of play during or after any game.
  23. Coaches and players not complying with this may be subject to ejection. All ejections are reported to the LMBA Executive and will be dealt with accordingly.
  24. Coaches that have an issue with a (the) umpire(s) will complete the online umpire evaluation form and provide as much information as possible regarding the situation(s) that need addressing. The Umpire-in-Chief will follow up on the evaluation.
  25. There shall be no spectators behind home plate, except for the official team scorekeeper and pitch counter. Spectators are permitted to be in the stands or in the outfield. Spectators are to refrain from coming into the player's area (dugouts/ area surrounding the dugout*). This is done out of respect for the players and the coaches. *Should a team not be able to use the dugouts, players will set up their “dugout” along the first and third baseline. Spectators are not to sit where the teams are set up.
  26. There shall be no use of cameras (phone or otherwise) on the playing fieldduring the game unless being used for the purposes of the LMBA.
  27. No protests are allowed during league play. If you have an issue please notify the Mosquito Division Manager.
  28. Second year Tadpole players will be eligible to play if a team is short of players, so long as it does not conflict with their own Tadpole scheduled game. BC Minor limits 5 regular season games plus one tournament for Tadpole player eligibility in the Mosquito Division, and has stiff penalties for violations. Teams are encouraged to call up second year Tadpole players when they have 9 or less players available for a game. Coaches are requested to inform the Tadpole player’s coach when asking a Tadpole player to play in a Mosquito game. Tadpole players must wear their regular team uniform when playing Mosquito games. Tadpole players are not allowed to pitch in the Mosquito division.
  29. Game Rules
    1. All players are to remain in the dugout or on the benches at all times when their team is at bat except the on-deck batter. Players warming up to return to the defensive line-up can do so in the out of bounds area nearest their dugout.
    2. Coaches or players must warm up pitchers only. A catcher’s mask must be worn when warming up a pitcher.
    3. Fair Play Rule: No player shall sit out more than one (1) inning consecutively and a maximum of two (2) innings per game. (The only exception is for injury or discipline reasons.) In the case of an extra inning game, this rule will apply separately to each set of six innings in succession. If player cannot play defensively he must come out of the game.
    4. Infield Positions Infield positions – Players are allowed to play a maximum of four (4) innings infield, of which only one position may be played twice. The only positions exempt from this is are the pitcher and catcher. Your pitcher and catcher may occupy the position for a maximum of three (3) innings each. Only two (2) of the innings played at pitcher and catcher will count towards their infield time. Each catcher MUST wear a new set of catcher's gear – NO EXCEPTIONS.

    E.g. If Bob plays three innings at catcher, Bob can still play one (1) inning at 1st base and one (1) inning at 3rd base.

    1. Outfield positions - Players shall be allowed to play a maximum of three (3) innings per game. All outfield positions are considered to be the same position.
    2. All Players are to bat (i.e. placed in the batting order line up).  Players must have their shirts properly tucked in when batting. Players who arrive late will be added to the bottom of the line-up.
      1. Players will be warned once about throwing of bats, helmets, etc. The second occurrence could result in ejection by the Umpire (Umpire decision).
    3. The batter is out on the third strike whether the ball is caught or not. The ball is live and runners may attempt to advance.
    4. Bunting is allowed.
    5. On an overthrow to first or third base that goes into out of bounds territory, the runners will advance one base beyond the last base he was attempting to reach or had safely reached when the overthrow was made.
    6. The ball is considered to be in play so long as it remains inside the fenced area of the ball field and runners may continue to advance as far as they want.
    7. Stealing a base is allowed, but Lead Offs are not allowed. Runners may not leave the base until the ball has crossed home plate. The penalty for a runner leaving early is to be called out (Umpire’s Decision). The ball is live and play shall continue as if there was no lead off.
    8. Runners cannot steal while the pitcher is on the rubber and in the pitching position with the ball in his possession.
    9. No stealing of home is allowed in the first two innings. The only two (2) ways a player can score in the first two innings is if forced in by a walk or the continuation of a play beginning with a hit ball
    10. Slide or avoid rule is in effect.
    11. No head first sliding unless being forced back to a base.  Penalty is an automatic out.
    12. The infield fly rule is not in effect (i.e. Umpires shall not call an automatic out).

Pitching Rules

  1. All BC Minor and LMBA pitching rules are in effect.
  2. Number of Pitches & Required Rest:
    • 1 – 25 pitches = no rest
    • 26 - 40 pitches = 2 nights rest
    • 41- 55 pitches = 3 nights rest
    • 56 - 65 pitches = 4 nights rest
    • 66 - 75 pitches = 5 nights rest
  1. Pitchers may only pitch on three (3) consecutive days if their combined total for days 1 and 2 do not exceed 25 pitches and games are during spring tournaments, summer, single seasons or Provincials. Pitchers may not pitch on four (4) consecutive days.
  2. A rainout or delayed/suspended game will not affect the pitching regarding the 2 or 3 nights rest rule, so any pitcher who was ineligible to pitch when the game was originally supposed to start shall remain ineligible when the game is played.
  3. The first two innings of each game must be pitched by a first year player defined as a player who did not play in the Mosquito Division in a previous year, and who is eligible to play one more year in the Mosquito Division.
  4. The first two innings of every Mosquito game will be limited to a maximum run count of two (2) runs per team per inning.  Innings three (3) through five (5) will have a maximum run count of four (4) runs per team per inning.  Inning six (6) , or last inning declared by the umpire due to time limit or darkness, will be an open inning with no maximum run limit.
  5. Maximum number of innings a player can pitch in one game is three (3) innings. A player who pitches three (3) innings in a game may not pitch at all in his team’s next game regardless of when that game is scheduled.
  6. Wild pitch rule: pitcher hits 2 players in one game—pitcher will be removed from the mound unless the umpire determines that the batter could have avoided being hit through a reasonable effort (Umpire’s decision).
  7. Balks are not called except as follows:
    • · When with runners on base, the pitcher fails to deliver the pitch after beginning his pitching motion, the umpire shall call, “Time…no pitch”. The umpire shall relate to the pitcher that he must deliver the ball without stopping his motion as this is a ball.  No runners may advance on the call.  Any subsequent failure to deliver the pitch after starting his motion, the umpire shall call “Time, ball”, and then charge the pitcher with a ball.  No runners may advance on the ball.
      Note: The intent of this rule is to prevent pitchers from stopping their delivery to home plate when they see a batter square to bunt.
  8. Coaches may visit the mound once per inning per pitcher. If exceeded, the pitcher must be replaced.
  9. Once a pitcher is removed from pitching in a game, they cannot re-enter the pitching position during that game.


Playoff and tournament rules are the same as regular season with these exceptions

  1. Home team is decided by a coin toss, unless specified in the tournament schedule.
  2. Home team in semi-finals will be decided as to how they place in the round robin. In the final game the higher placed team will have choice of visitor or home.
  3. During the round robin if at the end of the 6thinning or the time limited has been reached, the game is tied a maximum of two extra inning will be played; International tiebreaker rules will apply. The international Tiebreaker Rule:  The last batter of the current inning will be placed on second base with one out. The next individual in the lineup will be placed at bat and play will continue from that point.  Both home and away teams will be given this opportunity.
  4. Shall the game still remain tied, it will be recorded as a tie.
  5. During the final or semi-final game, if at the end of the 6thinning or if the time limit has been reached, the game is tied, extras innings shall be played until a winner is declared. The international tiebreaker rule does not apply in either the final or semi-final game.
  6. In an extra inning game, rules 3, 4 and 5 under Game Rules shall be applied separately to innings one through six and 7 through 12.

e.g. A player who played the maximum number of innings during innings one through six, will be allowed to play that same position for the maximum number of innings during innings seven through 12.

  1. Winning team must report game score to concession stand.
  2. Home team is required to have the umpires sign their scorebook.
  3. In the event of a protest, the tournament committee will review and make the ruling.
  4. One MVP will be selected from each team for each game.
  5. Each team will be given two points for a win, one point for a tie and 0 points for a loss.
  6. Maximum run differential will be +7 / -7 runs in each game.
  7. In the In the event of a two way tie the following rules will be applied:
  • Best Plus/ Minus Record
  • Head to Head if applicable
  • **Runs Against: The team with the lowest runs against during round robin play
  • **Runs For: The team with the highest amount of runs scored during round robin play
  • Coin Toss
  1. Three/ Four-way ties will follow the same format as outlined in Rule 81. This format will be followed until a winner is declared.

** Runs for and against will based per innings played. Eg. if your team had 10 runs against in 7 innings, it would be average of 1.4 runs per inning. If the team you are tied with has 10 runs against but in 5 innings, it would be 2 runs per inning average, and your team would win the tie breaker.

Official Score Keeping and Pitching Records

  1. The home team’s scorekeeper will be considered the official scorekeeper.
  2. Each team’s official scorekeeper will be responsible for completing their respective team’s pitch count sheet. Team Managers must sign each team’s pitch count sheet, and they must be handed into concession at the end of each game – No exceptions to this rule!
  3. Each team’s completed pitch count sheet is to be placed in the Pitch Count Binder in the concession, prior to leaving the field.  Blank Pitch Count Sheets can be found in the back section of the Pitch Count Binder.

11U "Mosquito" Documents