Walnuts Per USDA FoodKeeper
On the counterCounter
2–4 weeks
cool, dry place
In the fridgeFridge
9–12 months
at or below 40°F (4°C)
In the freezerFreezer
24 months
at 0°F; quality, not safety
Quick answer
Yes. Walnuts last 9–12 months in the fridge and 24 months in the freezer. After that, or sooner if stored badly, they spoil: watch for the signs below.
How to tell if walnuts are bad
Smell
Rancid: like crayons, paint or old nuts.
Taste
Bitter or soapy aftertaste.
Texture
Sticky or gummy residue around the lid.
Colour
Darkened or cloudy where it should be clear.
Walnuts past the expiration date
Best-by and sell-by
FoodKeeper gives unopened walnuts 2–4 weeks in the pantry or 9–12 months in the fridge, counted from the day you buy it. "Best-by" and "sell-by" describe quality and stock rotation, not safety; only infant formula carries a federally required use-by date.
Past the date
Walnuts past their best-by date are usually safe if stored well; check smell, look and taste before using.
How to keep walnuts fresh longer
- Keep in a cool, dark place, tightly closed, away from heat.
- Refrigerating nuts, seeds and nut oils extends shelf life significantly.
- Smell before using; rancidity is a quality problem you can detect.
More about walnuts
FAQ
How long does it take for walnuts to go bad?
9–12 months in the fridge, per USDA FoodKeeper.
Can walnuts expire?
FoodKeeper gives unopened walnuts 2–4 weeks in the pantry or 9–12 months in the fridge, counted from the day you buy it. "Best-by" and "sell-by" describe quality and stock rotation, not safety; only infant formula carries a federally required use-by date.
What happens if you eat bad walnuts?
Usually an unpleasant taste rather than illness, but discard anything mouldy, rancid or smelling off.
How do you keep walnuts from going bad?
Keep in a cool, dark place, tightly closed, away from heat.
Numbers on this page come from USDA FoodKeeper and FSIS guidance. Last verified November 2026. How we verify our data · Report a wrong number