Maple Syrup

The answer

Opened maple syrup keeps indefinitely in the fridge. Mold on the surface can be skimmed — but discard if it returns quickly.

Caution Refrigeration prevents surface mold. If mold appears, skim and reheat to a brief boil — or discard if unsure.

How long it keeps

Fridge (40°F) Indefinite (opened) safe window
Freezer (0°F) Indefinite best quality
Room temp Refrigerate after opening then discard
Discard Discard if fermented, fizzy, or repeatedly moldy after skimming.

By state & packaging

State Fridge Freezer
Opened, refrigerated Indefinite Indefinite
Unopened, pantry

Signs it has gone bad

Surface mold
Fermented or boozy smell
Fizzing on opening

FAQ

Is mold on maple syrup dangerous?

Skim mold and briefly boil the syrup — many producers say it is still usable. If mold returns quickly or the syrup smells fermented, discard it.