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⚖️ League Rules

Mountainside Aces Official Regulations

2026 Summer & Fall Season

Official Documents

Official league documents, permits, and memos from the Recreation Department.

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Roster Rules & League Eligibility

Summer League Eligibility

Residency Requirement: Must live or work in Mountainside
Out of Town Players: Teams may roster a maximum of 3 out-of-town players
  • Players who work for Mountainside (Police, DPW, Boro Admin) will be considered residents
Roster Size: Capped at 15 players for the summer season
  • Additional players may be added only if other teams are full

Fall League Eligibility

Must meet ONE of the following criteria:
  • Live or work in Mountainside AND be over 30 years old
  • Have played in a previous Fall season ('22, '23, '24)

Free Agency Draft Pool (Summer and Fall)

Players will no longer be permitted to freely switch teams. At the end of every season, returning players may either:
  • Remain on their current team, OR
  • Enter the free agency draft pool, which is conducted in order of last season's reverse standings (regular season + playoff records)
Exemptions from the Free Agency Pool:
  • Immediate family members (defined as father, son, or brother)
  • Out-of-town players

Competitive Rebalancing

  • Rosters may be combined/adjusted season to season to improve balance
  • Mandatory minimum number of players on each roster will be enforced
  • Final roster numbers dictated by registration totals and number of teams

General Rules

Regular Season

Summer: 23 games per team, followed by double elimination playoffs
Fall: 12 games per team, followed by double elimination playoffs

Minimum Players to Start

Summer: A team must have 8 rostered players to start a game
  • Fewer than 8 = automatic forfeit (opposing team wins 7-0)
  • If neither team has 8 players, the game is recorded as a Tie
Fall: A team must have 7 rostered players to start a game
  • Fewer than 7 = automatic forfeit (opposing team wins 7-0)
  • If neither team has 7 players, the game is recorded as a Tie
Time Limit: No new inning starts after 60 minutes of game play
  • Game 1 clock begins at scheduled time (no exceptions)
  • Taking the field late = lost time
  • No time limit in playoffs
Official Game: 5 full innings (or 4½ if home team is leading) must be completed
  • If incomplete, game restarts on makeup date
Adding Players Mid-Game: Rostered players can be added before the start of the 4th inning
  • New players bat at the bottom of the order
  • No players may join after the first pitch of the 4th inning
8-Player Game Special Rule: If you have only 8 rostered players, the opposing team must provide a catcher
  • This catcher cannot make any plays in the field
  • Other position players cover home plate
9-Player Rule: If you have 9 players, one MUST play catcher (no courtesy catcher provided - 0 exceptions)
Ejections:
  • 1st ejection: Miss remainder of game + 1 game suspension
  • 2nd ejection: 3-game suspension
  • 3rd ejection: Suspended for remainder of season
Fighting: Any player striking another or involved in a fight will be thrown out of the League indefinitely
Equipment: No metal spikes allowed
Substitutes: There will be NO substitutes in 2025 (0 exceptions)

In-Game Rules

Line-Up/Defense

Batting Each player that shows up must be in the batting line-up for that game
Defense Players are not required to play the field. Defense is left entirely up the coach/team's decision

Pitching

Pitch Height: Slow pitch rule 6' to 12' (no lower, no higher)
Pitcher Position: Must have one foot on the rubber while throwing
  • If pitching behind the rubber, must have one foot in-line with the rubber
Pitcher Equipment: Pitchers cannot wear anything on their throwing hand

Strike Zone

Strike Extension: A rubber plate extension is used for calling strikes
  • If pitch lands on home plate OR the extension = strike

Base Running

Leaving the Base: Runner must wait until contact is made
  • Leaving early may result in being called out by the umpire
Scoring: Runner can touch either home plate OR the extension when scoring
Non-Contact League: Must slide or avoid contact ("give yourself up") at all times
  • Applies to attempted double plays
  • Hard take-out slides and baseline interference = automatic double play
Phantom Tags: Not tolerated - penalty at umpire's discretion

Batting

Count: Each batter starts with a 1-1 count
  • Foul ball with 2 strikes = strikeout
  • No courtesy foul
Player Leaving Early Should a player need to leave early for any reason
  • The batting order will just skip the player's prior spot. There is no automatic out applied.
Batter's Box: A defined batter's box will be used. At least one foot must remain in the box at all times during the at-bat
No Distractions: No vocal or visual distractions are permitted during the pitch

Mercy Rule

Game-Ending Mercy Rules:
  • 15 runs after 4 innings
  • 12 runs after 5 innings

Field Boundaries

Light Poles/Boxes:
  • Above fence line = home run
  • Below fence line = live ball
Deerfield Ground Rule: A ball that passes through the center field gap will be ruled a ground-rule triple

Catch and Carry Rule

If a ball is caught in-play and the player's momentum carries them out of play:
  • Ball remains live
  • Runners are NOT awarded a base

Ball Thrown Out of Play

If a ball is thrown out of play, the play is blown dead and:
  • If the ball is thrown from the infield, runners are awarded 1 base
  • If the ball is thrown from the outfield, runners are awarded 2 bases

Rules Controversy

If a situation arises not covered by these rules or a dispute occurs:
  • Only captains may discuss rules interpretations or raise issues with the umpire
  • Judgment calls will not be argued by anybody
  • If no agreement is reached, the umpire makes the final decision

Courtesy Runners

Pre-Game Declaration: Before each game, a team can declare up to 2 players who will get a courtesy runner for the entire game
Injury During Game: Additional courtesy runners can be used for players injured during the game
  • Once an injured player takes a courtesy runner, they must use one from that point forward
  • No limit on courtesy runners per inning due to injury
Who Runs: Courtesy runners are the last batted out
  • No outs in current inning → last batted out from previous inning
  • Need for 2nd runner before another out → revert to 2nd-to-last batted out
  • No recorded outs in first inning → last person in batting order
  • Same runner cannot run twice consecutively

Scheduling

Schedule Lock: Entire regular season and playoff schedule set and locked before season start
Weather Rescheduling: Games only rescheduled due to weather
  • Rainout dates built into schedule
  • Added to days where games are already being played
Team Cannot Field 8 Players: Opposing captain can either:
  • Take a forfeit win, OR
  • Choose to reschedule with the other captain
Both Teams Cannot Field 8 Players: Game recorded as a Tie or rescheduled by mutual agreement
Post Season Start Date: Hard start date for playoffs
  • Summer: If teams haven't completed 23 regular season games, standings determined by winning percentage
  • Fall: If teams haven't completed 12 regular season games, standings determined by winning percentage

Playoff Rules

Minimum Games Required: To be eligible for playoffs:
  • Summer: You must play in at least 8 of your team's regular season games
  • Fall: You must play in at least 4 of your team's regular season games
Playoff Tiebreakers
  • 2 Teams Tied: 1. Head to Head 2. Runs Allowed 3. Run Differential
  • 3+ Teams Tied: 1. Runs Allowed 2. Run Differential

Equipment

Eligible Bats:
  • Only wooden bats are allowed
Softballs Used:
  • Clinchers supplied by the League