Held at 0°F / -18°C, it keeps its quality for roughly 6 months. Expect the texture to change, so plan to cook or bake with it.
Yes, though the texture changes. Held at 0°F (-18°C), parmesan cheese stays good in the freezer for 6 months, versus 3–4 weeks in the fridge.
Freezing parmesan cheese, step by step
- Cut it into pieces of ½ lb or smaller, or put shredded cheese in the freezer right in its bag.
- Wrap it in plastic and then a freezer bag, pressing the air out.
- Defrost it in the fridge; the texture turns crumblier, so melt it or cook with it.
Thawing parmesan cheese safely
Overnight in the fridge
Transfer it to the fridge the evening before you need it; texture holds up best this way.
On the counter
Reserve this for shelf-stable items; perishable food shouldn't be left to thaw on the counter.
Straight from frozen
Plenty of foods can be added still frozen to soups, sauces, smoothies or a hot oven.
Counter, fridge or freezer: the numbers
How freezing changes parmesan cheese
Hard cheeses take to freezing fairly well but turn more crumbly, so frozen cheese is best used grated or melted. Fresh and soft cheeses lose their creaminess and may become grainy or watery. Freeze cheese shredded or in small blocks, wrapped airtight, and let it thaw slowly in the fridge.
How long parmesan cheese keeps with each storage method
| Storage | How long | Temp | Packaging | Good to know |
|---|---|---|---|---|
| Refrigerator (opened) | 3–4 weeks | ≤ 40°F / 4°C | Airtight | 40°F (4°C) or colder |
| Freezer (opened) | 6 months | 0°F / -18°C | Wrapped or freezer bag | 0°F; for quality, not safety |
| Refrigerator (unopened) | 6 months | ≤ 40°F / 4°C | Airtight | 40°F (4°C) or colder |
Getting to know parmesan cheese
Parmesan cheese sits in the dairy & eggs section of our food guide. USDA FoodKeeper lists parmesan cheese under “Cheese (hard such as cheddar, swiss, block parmesan)”, so this page uses that entry's storage times. Going by USDA FoodKeeper, it lasts 3–4 weeks in the fridge and 6 months in the freezer. It falls into the lower-risk group, so storing it well is mostly about keeping quality rather than about safety. Best storage spot: choose a middle shelf over the door, which warms up each time someone opens it.
Cheese is essentially milk preserved with acid and salt, with much of its moisture pressed out, which is why it lasts far longer than milk does. Moisture is the biggest factor in its shelf life: hard, aged cheeses can keep for weeks or months, whereas fresh and soft cheeses act more like fresh dairy and last anywhere from a few days to about two weeks once opened.
What makes parmesan cheese spoil
Cheese most often spoils by growing mold. In hard cheese the mold can't push its roots very deep, so it is fine to cut off at least 2.5 cm (1 inch) around and beneath the spot. In soft, crumbled or shredded cheese, mold can spread invisibly through the whole thing, so all of it should go in the trash. Soft cheese that is past its prime also starts to smell of ammonia as bacteria break it down.
Mistakes people make storing parmesan cheese
- Sealing it tightly in plastic wrap, which holds in moisture and invites slime and mold.
- Trimming mold off shredded or soft cheese and eating what's left.
- Leaving a cheese board out in a warm room for hours.
- Freezing soft cheese and expecting it to come out with the same texture.
Choosing good parmesan cheese at the store
- For longer life, buy a block of hard cheese instead of the pre-shredded kind.
- Make sure packages are sealed, with no moisture or mold visible inside.
- Choose a size of soft cheese you will use up within its opened window.
Parmesan cheese: ways to finish it in time
- Shred hard cheese and freeze it for cooking.
- Melt it into sauces, grilled cheese sandwiches, gratins and omelets.
- Before its time runs out, fold soft cheese into pasta, a dip or a baked dish.
Making sense of expiration dates
The dates printed on parmesan cheese packaging mostly describe quality rather than safety. Under US rules, infant formula's use-by date is the only one federal rules require; manufacturers choose all the others themselves. A “Best if used by” date marks when flavor and texture are at their peak. A “Sell-by” date helps the store rotate its stock, and once it passes you can still keep the food at home for its usual storage time. A “Use-by” date is the manufacturer's own pick for the final day of best quality.
For that reason, the storage times on this page start counting from the moment you open, cook or buy parmesan cheese, not on the date stamped on the package: 3–4 weeks in the fridge. Food that was stored properly can still be good after a best-by date, while food that was handled carelessly can go bad long before it.
The best place for parmesan cheese
Choose a middle shelf over the door, which warms up each time someone opens it.
Check the freezer time on your parmesan cheese
Held at -18°C (0°F), parmesan cheese is comfortably inside the 6 months quality window. Defrost in the fridge, then use it over the following day or two.
Held at -18°C (0°F), parmesan cheese is comfortably inside the 6 months quality window. Defrost in the fridge, then use it over the following day or two.
Safe, though it is reaching the end of peak quality. Plan to use it within a few weeks, since flavor and texture decline after 6 months.
Staying frozen solid keeps food safe with no time limit, but by 9 months you can expect flat flavor and some freezer burn. Use it in soups, sauces or baking, and cut away any dry gray patches.
Staying frozen solid keeps food safe with no time limit, but by 12 months you can expect flat flavor and some freezer burn. Use it in soups, sauces or baking, and cut away any dry gray patches.
Based on -18°C (0°F) or below. Food kept frozen remains safe, so these results describe quality only.
Your parmesan cheese storage questions
How long does parmesan cheese last in the fridge?
3–4 weeks when held at 4°C (40°F) or below (opened). Seal it well so it stays free of moisture and fridge odors.
How long does parmesan cheese last in the freezer?
6 months at -18°C (0°F) for peak quality. It remains safe for as long as it stays frozen; past that point, flavor and texture slowly decline.
How long does parmesan cheese last at room temperature?
Room-temperature storage does not suit it; keep it in the fridge.
How long does parmesan cheese last after opening?
3–4 weeks refrigerated after opening. As soon as the seal is broken, the date on the package no longer counts.
How long does unopened parmesan cheese last?
6 months in the refrigerator, provided the seal is unbroken and it is stored the way the label directs.
How long is parmesan cheese good after the expiration date?
Counting from the purchase date, FoodKeeper allows unopened parmesan cheese 6 months in the refrigerator. Labels such as "best-by" and "sell-by" are about peak quality and how stores rotate stock, not about safety — infant formula is the one product whose use-by date federal law requires.
How do you know if parmesan cheese is bad?
A sharply sour or ammonia smell, stronger than that cheese normally has. A slimy surface, or cheese that has dried out and cracked right through. Edges that have yellowed or darkened, or colors that don't belong to that style of cheese.
Parmesan cheese myths: fact or fiction?
- You got it!Not this time.
Partly true. Because parmesan cheese is low-risk, going slightly beyond 3–4 weeks usually costs quality rather than safety. Look for mold and sniff for off odors first.
- You got it!Not this time.
False. The freezer puts bacteria on hold rather than killing them. They start up again as the food warms, so let it thaw in the fridge, then cook or reheat it all the way through.
- You got it!Not this time.
Partly. Held at 0°F / -18°C, it keeps its quality for roughly 6 months. Expect the texture to change, so plan to cook or bake with it.
- You got it!Not this time.
False. Each time the fridge is opened, the door heats up. Choose a middle shelf over the door, which warms up each time someone opens it.
- You got it!Not this time.
Not for safety reasons, but refrigeration keeps it at peak quality for longer. Go by the storage times listed on this page.
