Per USDA FoodKeeper
On the counterCounter
1–2 days
cool, dry place
In the fridgeFridge
Not needed
shelf-stable
In the freezerFreezer
Not needed
keeps without freezing
On the counterCounter
6–12 months
cool, dry place
In the fridgeFridge
Not needed
shelf-stable
In the freezerFreezer
Not needed
keeps without freezing
Quick answer
Yes. Microwave popcorn lasts 1–2 days in the pantry. After that, or sooner if stored badly, it spoils: watch for the signs below.
How to tell if microwave popcorn 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.
Microwave popcorn past the expiration date
Unopened
FoodKeeper gives unopened microwave popcorn 6–12 months in the pantry, 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.
Opened
Once opened, the printed date no longer applies. Count 1–2 days in the pantry from the day you open it.
How to keep microwave popcorn fresh longer
- After opening time applies to prepared product.
- Store in an airtight container in a cool, dark, dry place.
- Keep away from the stove and dishwasher, where heat and humidity speed spoilage.
More about microwave popcorn
FAQ
How long does it take for microwave popcorn to go bad?
1–2 days in the pantry, per USDA FoodKeeper.
Can microwave popcorn expire?
FoodKeeper gives unopened microwave popcorn 6–12 months in the pantry, 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 microwave popcorn?
Usually an unpleasant taste rather than illness, but discard anything mouldy, rancid or smelling off.
How do you keep microwave popcorn from going bad?
After opening time applies to prepared product.
Numbers on this page come from USDA FoodKeeper and FSIS guidance. Last verified November 2026. How we verify our data · Report a wrong number