Per USDA FoodKeeper
On the counterCounter
Refrigerate
once opened
In the fridgeFridge
7–10 days
at or below 40°F (4°C)
In the freezerFreezer
Not listed
no FoodKeeper figure
On the counterCounter
Not recommended
keep it cold
In the fridgeFridge
1–3 months
at or below 40°F (4°C)
In the freezerFreezer
Not listed
no FoodKeeper figure
Quick answer
Yes. Ultra-pasteurized milk lasts 7–10 days in the fridge. After that, or sooner if stored badly, it spoils: watch for the signs below.
How to tell if ultra-pasteurized milk 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.
Ultra-pasteurized milk past the expiration date
Unopened
FoodKeeper gives unopened ultra-pasteurized milk 1–3 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.
Opened
Once opened, the printed date no longer applies. Count 7–10 days in the fridge from the day you open it.
How to keep ultra-pasteurized milk 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 ultra-pasteurized milk
FAQ
How long does it take for ultra-pasteurized milk to go bad?
7–10 days in the fridge, per USDA FoodKeeper.
Can ultra-pasteurized milk expire?
FoodKeeper gives unopened ultra-pasteurized milk 1–3 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 ultra-pasteurized milk?
Usually an unpleasant taste rather than illness, but discard anything mouldy, rancid or smelling off.
How do you keep ultra-pasteurized milk 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