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Lightning Safety (House League)

If any GMBA umpire assigned to a game hears thunder during a game, the Home Plate umpire will immediately end the game. In leagues that do not have an assigned GMBA umpire, the home team coach is required to end the game if he or she hears thunder.  

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Lightning Safety (Rep League)

Baseball Ontario follows Environment Canada 2016 guidelines with respect to lightning safety.

As soon as thunder is heard, the potential to be struck by lightning is present. Baseball Ontario mandates that at first sound of thunder, play is to be suspended and all participants are to seek shelter until 30 minutes after the last sound of thunder.

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Rules & Constitution 

GMBA Constitution

Revised 2018 - November

GMBA Rules - House League

Revised 2019 - April

GMBA Rules - Rep

Revised 2018 - March

GMBA Rules - Select

Revised 2016 - March

ICBA Playing Rules

ICBA website Handout Section

ICBA Constitution

ICBA website Handout Section

OBA Constitution

OBA website Constitition & Playing Rules

REP 2018 Tryouts

Tryout Rules, Revised 2016

Sponsorship Form

Revised 2015

Official Rules of Baseball


SWOBA 2019 Select Rules


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