Per USDA FoodKeeper
On the counterCounter
Refrigerate
once opened
In the fridgeFridge
5–7 days
at or below 40°F (4°C)
In the freezerFreezer
Not recommended
texture or safety suffers
On the counterCounter
Use-by date
cool, dry place
In the fridgeFridge
Not needed
shelf-stable
In the freezerFreezer
Not recommended
texture or safety suffers
Quick answer
Yes. Polenta lasts 5–7 days in the fridge. After that, or sooner if stored badly, it spoils: watch for the signs below.
How to tell if polenta is bad
Smell
Musty, sour or rancid odour.
Texture
Clumping from moisture, or a damp feel.
Pests
Webbing, holes, or tiny insects in the bag.
Flavour
Flat, stale or bitter taste — quality is gone even if it is safe.
Polenta past the expiration date
Unopened
Follow the package date. "Best-by" and "sell-by" describe quality and stock rotation, not safety; only infant formula carries a federally required use-by date.
Opened
Once opened, the printed date no longer applies. Count 5–7 days in the fridge from the day you open it.
How to keep polenta fresh longer
- Store in an airtight container in a cool, dark, dry place.
- Keep away from the stove and dishwasher, where heat and humidity speed spoilage.
- Write the opening date on the pack.
More about polenta
FAQ
How long does it take for polenta to go bad?
5–7 days in the fridge, per USDA FoodKeeper.
Can polenta expire?
Follow the package date. "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 polenta?
Usually an unpleasant taste rather than illness, but discard anything mouldy, rancid or smelling off.
How do you keep polenta from going bad?
Store in an airtight container in a cool, dark, dry place.
Numbers on this page come from USDA FoodKeeper and FSIS guidance. Last verified November 2026. How we verify our data · Report a wrong number