Unopened UHT MilkShelf Life, Storage, and Spoilage Guide
Pantry
several months
Store in a cool, dry place away from direct sunlight. Do not store above 90°F (32°C).
Refrigerator
several months (until 'Best By' date)
Refrigeration is not required for unopened UHT milk, but it will not harm the product. Once opened, refrigerate promptly.
Freezer
3 months (for best quality)
Freezing milk can change its texture, making it somewhat grainy or separated when thawed. It is still safe to consume. Thaw in the refrigerator. Freezing unopened cartons may cause them to burst.
Signs of Spoilage
- Sour odor
- Off-flavor
- Curdled or lumpy texture
- Mold growth (once opened)
- Bloated or leaking packaging (for unopened product, indicates spoilage)
Room Temperature Safety
40°F–140°F (applies once opened)
Unopened UHT milk is shelf-stable and does not require refrigeration until opened. Once opened, it must be refrigerated and treated like regular milk, adhering to the 2-hour rule to prevent bacterial growth if left at room temperature.
Safe Handling
Unopened UHT milk is shelf-stable and does not require refrigeration until opened.
Once opened, UHT milk must be refrigerated promptly and consumed within 7 days, similar to regular pasteurized milk.
Do not consume if the packaging is bloated, leaking, or damaged, even if unopened.
Always check the 'Best By' date before consumption.