How long do rolled oats last?
Unopened, they keep in the cupboard for about 1 year. Once opened, in the cupboard for about 6 months.
This refers to: Rolled oats.

Shelf life of rolled oats at a glance
| Storage | Unopened | Opened |
|---|---|---|
| Cupboard | 1 year | 6 months |
Once opened, move them into an airtight container to keep out moisture and pantry moths. Discard oats that smell rancid.
Past its date does not mean spoiled
These are guide values for food stored correctly. A best-before date is not a throw-away date: many products are still fine after it. Check how it looks, smells and tastes. Mould, an unusual smell or a bulging can are reasons to throw it away. A use-by date is different: do not eat the food after it.