Genuine Maple syrup (unopened, plastic) keeps about 18–24 months in the fridge at 40°F (4°C) or below, counting from the day you bought it.
18–24 months sealed in the fridge, against 2 years sealed in the pantry. Green is what this situation leaves you; husk is what it spends.
| Situation | Keeps for |
|---|---|
| Unopened · pantry | 2 years |
| Unopened · fridge | 18–24 months |
Air and warmth are what shorten an opened item's life — the right container buys back the days the packaging gives up once the seal's broken.
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About 18–24 months 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, plastic) 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. Those are the general signs for pantry staples — USDA FoodKeeper v128 publishes no spoilage note for Genuine Maple syrup (unopened, plastic) specifically. Never taste something to test it — when in doubt, throw it out.