Fridge popping breaker when plugged into garage outlets
If it's a GFCI breaker, then it's common for fridges and GFCIs to not get along so well.

If it's not a GFCI receptacle, you'll want to make sure the fridge is not overloading the circuit. If you've added anything new to the circuit, then that may be the case.  

If neither of these are true, then it could be as simple as the breaker going bad. They are a mechanical device, and can go bad.