Duck fat Per USDA FoodKeeper
On the counterCounter
Not recommended
keep it cold
In the fridgeFridge
30 days
at or below 40°F (4°C)
In the freezerFreezer
Not listed
no FoodKeeper figure
Quick answer
Yes. Duck fat lasts 30 days in the fridge. After that, or sooner if stored badly, it spoils: watch for the signs below.
How to tell if duck fat is bad
Smell
Fermented, yeasty or sour beyond the product's usual tang.
Texture
Separation that does not stir back, or a slimy layer.
Colour
Darkening or a change in colour at the top of the jar.
Mould
Any fuzz on the surface or lid — discard the jar.
Duck fat past the expiration date
Best-by and sell-by
FoodKeeper gives unopened duck fat 30 days 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
Duck fat past its best-by date is usually safe if stored well; check smell, look and taste before using.
How to keep duck fat fresh longer
- Refrigerate after opening unless the label says otherwise.
- Use a clean utensil each time; crumbs and double-dipping shorten shelf life.
- Wipe the rim and close the lid tightly.
More about duck fat
FAQ
How long does it take for duck fat to go bad?
30 days in the fridge, per USDA FoodKeeper.
Can duck fat expire?
FoodKeeper gives unopened duck fat 30 days 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 duck fat?
Usually an unpleasant taste rather than illness, but discard anything mouldy, rancid or smelling off.
How do you keep duck fat from going bad?
Refrigerate after opening unless the label says otherwise.
Numbers on this page come from USDA FoodKeeper and FSIS guidance. Last verified November 2026. How we verify our data · Report a wrong number