Opened parmesan cheese lasts 3–4 weeks in the fridge and 6 months in the freezer. Unopened, it keeps 6 months in the fridge.
USDA FoodKeeper lists parmesan cheese under “Cheese (hard such as cheddar, swiss, block parmesan)”, so this page uses that entry's storage times.
Shelf life at a glance
Bars show the longest recommended time for each place. Scale runs from 1 hour to 2 years.
- 1Use within days
- 2Keeps a week or two
- 3Keeps for months
- 4Keeps a long time
Based on the longest fridge or pantry time.
About 11–18 more days in the fridge.
About 7–14 more days in the fridge.
It's inside the safe window but near the end. Eat it today or freeze it now.
Past the recommended fridge time. Even if it looks and smells fine, throw it out.
Past the recommended fridge time. Even if it looks and smells fine, throw it out.
Counted from the day it was cooked, opened or bought. Assumes a fridge at 4 °C (40 °F) or colder.
Parmesan cheese storage times by method
| Method | Duration | Temperature | Container | Notes |
|---|---|---|---|---|
| Refrigerator (opened) | 3–4 weeks | ≤ 40°F / 4°C | Airtight | at or below 40°F (4°C) |
| Freezer (opened) | 6 months | 0°F / -18°C | Freezer bag or wrap | at 0°F; quality, not safety |
| Refrigerator (unopened) | 6 months | ≤ 40°F / 4°C | Airtight | at or below 40°F (4°C) |
Where to store parmesan cheese
Keep it on a middle shelf, not the door: the door warms up every time it opens.
Parmesan cheese shelf life, answered
How long does parmesan cheese last in the fridge?
3–4 weeks at 4°C (40°F) or colder (opened). Keep it sealed so it does not pick up moisture or odours.
How long does parmesan cheese last in the freezer?
6 months for best quality at -18°C (0°F). Frozen food stays safe indefinitely; after that, texture and flavour fade.
How long does parmesan cheese last at room temperature?
It is not meant to be kept at room temperature. Refrigerate it.
How long does parmesan cheese last after opening?
3–4 weeks in the fridge once opened. The printed date stops applying the moment you break the seal.
How long does unopened parmesan cheese last?
6 months in the fridge, if the seal is intact and it is stored as the label says.
How long is parmesan cheese good for past the expiration date?
FoodKeeper gives unopened parmesan cheese 6 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.
How can you tell if parmesan cheese is bad?
Ammonia or a sharp sour smell beyond the cheese's usual aroma. Slimy surface, or very dry and cracked all the way through. Darkened or yellowed edges, or new colours that are not part of the cheese.
Signs parmesan cheese has gone bad
Smell
Ammonia or a sharp sour smell beyond the cheese's usual aroma.
Texture
Slimy surface, or very dry and cracked all the way through.
Colour
Darkened or yellowed edges, or new colours that are not part of the cheese.
Mould
On hard cheese, cut 1 inch around the spot. On soft or shredded cheese, discard.
Can you freeze parmesan cheese?
- 1Step 1
Cut or portion into blocks of ½ lb or less, or freeze shredded cheese in its bag.
- 2Step 2
Wrap in plastic, then a freezer bag, pressing out air.
- 3Step 3
Thaw in the fridge; it will be crumblier, so use it melted or cooked.
How to thaw parmesan cheese
In the fridge
Move it to the fridge the night before; texture holds best.
At room temperature
Only for shelf-stable foods; perishable food should not thaw on the counter.
From frozen
Many foods go straight into soups, sauces, smoothies or the oven.
Parmesan cheese left out overnight
Opened parmesan cheese belongs in the fridge. Overnight at room temperature speeds spoilage; if it smells, looks or tastes off, discard it.
Best-by and use-by dates on parmesan cheese
Unopened
FoodKeeper gives unopened parmesan cheese 6 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 3–4 weeks in the fridge from the day you open it.
How to store parmesan cheese
- Wrap in wax or parchment paper, then loosely in plastic, so it can breathe.
- Store in the cheese drawer or a lower shelf at 40°F (4°C) or below.
- Use a clean knife each time to avoid introducing mould.
Parmesan cheese vs similar foods
- Shredded cheese 1 month
- Parmesan cheese 3–4 weeks
- Hard cheese 3–4 weeks
- Cheddar cheese 3–4 weeks
- Cream cheese 2 weeks
- Brie 1–2 weeks
- Cottage cheese 1 week
Same scale as the timeline above: 1 hour to 2 years.
Check any food in seconds: when your leftovers expire, and whether something left out is still safe.
Similar foods
All cheese → Can you freeze… hub → Leftover calculator →Freezer time calculator →Left-out checker →