Opened hard cheese like cheddar or parmesan keeps 3-4 weeks in the fridge; unopened, about 6 months. It freezes for about 6 months, though texture becomes crumbly.
Storage times from USDA, FoodSafety.gov, FDA and university extension services. Checked .
How long does hard cheese last in the fridge?
3–4 weeks at 40°F (4°C) or below.
Can you freeze hard cheese?
Yes. For best quality use it within 6 months. Texture turns crumbly; best for cooking; best quality; safe indefinitely at 0°F.
- Freeze in blocks of 1 pound or less, wrapped airtight.
- Use thawed cheese for cooking; it crumbles.
After thawing: Thaw in the fridge and use within a few weeks, ideally in cooked dishes.
How long can hard cheese sit out?
No more than 2 hours at room temperature, or 1 hour when it's above 90°F (USDA's 2-hour rule). After that, throw it out.
How to tell if hard cheese has gone bad
- Mold (cut off at least 1 inch around it on hard cheese)
- Ammonia or sour smell
- Slimy surface
Bacteria that cause food poisoning don't always change the look or smell of food, so go by the storage times above. When in doubt, throw it out.
Questions people ask
Can I cut mold off hard cheese?
Yes, for hard cheese: cut away at least 1 inch around and below the spot, keeping the knife out of the mold.
Does parmesan need to be refrigerated?
Wedges of parmesan should be refrigerated once opened; shelf-stable grated parmesan follows the label.