How to store cereal
Best place: the pantry. Cereal is shelf stable and keeps for 6 to 12 months in a cool, dry cupboard, then 2 to 3 months once opened.

6 to 12 months
from the package date
No guideline
No guideline
How to tell cereal has gone bad
General signs for shelf stable foods, the group USDA lists cereal under.
- Crackers or cereal that have gone soft or stale, not crisp
- Rancid, paint-like smell from nuts, oils or nut butters
- Small insects or webbing inside a box or bag
- Spices that have lost their smell and colour
- Fermented or boozy smell from honey that has picked up moisture
More on shelf stable foods. The times above are quality guidelines, not safety limits; food that shows these signs goes out regardless of the date.
Storage habits that make the difference
Store dry pantry staples in a cool, dry cupboard away from the stove and direct sunlight, ideally in airtight containers once opened. Reseal cracker and cereal bags tightly with a clip or transfer them to a container to keep them crisp. Label opened jars with the date so older ones get used first.
Looking for one kind of cereal?
How to store other shelf stable foods
Source: USDA FSIS FoodKeeper dataset (public domain). How we decode the data.