Once opened, Cereal (ready-to-eat) keeps about 2–3 months in the pantry. Unopened, it keeps about 6–12 months.
| Situation | Keeps for |
|---|---|
| Unopened · pantry | 6–12 months |
| Opened · pantry | 2–3 months |
About 2–3 months in the pantry, according to USDA FoodKeeper v128.
Cereal (ready-to-eat) is shelf-stable at room temperature: cool, dry pantry, sealed — refrigerating after opening is optional and mainly preserves quality. 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.