Genuine Maple syrup (unopened, glass) keeps about Indefinitely in the fridge at 40°F (4°C) or below, counting from the day you bought it.
| Situation | Keeps for |
|---|---|
| Unopened · pantry | 4 years |
| Unopened · fridge | Indefinitely |
About Indefinitely at 40°F (4°C) or below, according to USDA FoodKeeper v128. That window runs from the day you bought it — FoodKeeper publishes no separate after-opening figure for this one.
Genuine Maple syrup (unopened, glass) is shelf-stable at room temperature: cool, dry pantry, or refrigerate at 40°F (4°C) or below to keep it longer. Refrigerating it mainly preserves quality rather than safety.
Look for: A rancid, paint-like, or musty smell; Bulging, leaking, deeply dented, or rusted cans; Insects or webbing in dry goods; Mould or discoloration. Never taste something to test it — when in doubt, throw it out.