Once opened, Flour (white) keeps about 1 year in the fridge. Unopened, it keeps about 6–12 months.
That's the longest window published for Flour (white) — opened in the fridge is its best case.
| Situation | Keeps for |
|---|---|
| Unopened · pantry | 6–12 months |
| Opened · pantry | 6–8 months |
| Opened · fridge | 1 year |
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 1 year refrigerated at 40°F (4°C) or below, according to USDA FoodKeeper v128.
Flour (white) 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; Clumping, or moisture in something that should be dry; Insects, webbing, or larvae in the package; Faded colour or a lost aroma. Those are the general signs for baking & cooking — USDA FoodKeeper v128 publishes no spoilage note for Flour (white) specifically. Never taste something to test it — when in doubt, throw it out.