Once opened, parmesan cheese lasts 3–4 weeks in the refrigerator and 6 months frozen. Unopened, it stays good 6 months in the refrigerator.
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USDA FoodKeeper lists parmesan cheese under “Cheese (hard such as cheddar, swiss, block parmesan)”, so this page uses that entry's storage times.
Storage times side by side
Each bar marks the longest recommended storage time for that spot, on a scale that spans 1 hour up to 2 years.
- 1Eat within a few days
- 2Lasts a week or two
- 3Lasts for months
- 4Lasts a very long time
Rated on whichever is longer: its fridge or pantry time.
Roughly 11–18 days left in the fridge.
Roughly 7–14 days left in the fridge.
Still within the safe window, but only just. Eat it today or move it to the freezer now.
Beyond the recommended fridge time. Throw it away, however normal it looks or smells.
Beyond the recommended fridge time. Throw it away, however normal it looks or smells.
Days count from when it was bought, opened or cooked, assuming a fridge set to 4 °C (40 °F) or below.
Test the timing 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 a freezer running at -18°C (0°F) or below. Food kept frozen remains safe, so these results describe quality only.
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.
The best place for parmesan cheese
Choose a middle shelf over the door, which warms up each time someone opens it.
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.
How to spot spoiled parmesan cheese
Odor
A sharply sour or ammonia smell, stronger than that cheese normally has.
Texture
A slimy surface, or cheese that has dried out and cracked right through.
Color
Edges that have yellowed or darkened, or colors that don't belong to that style of cheese.
Mold
On hard cheese, cut away at least 1 inch around and below the spot. Soft or shredded cheese should be thrown out.
No boxes ticked? That's encouraging. Even so, confirm how long it has been stored, because the germs behind food poisoning can't be seen with the naked eye.
Even one of these means it has spoiled. Toss it, and never taste it to find out.
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.
Can you freeze parmesan cheese?
- 1Step 1
Cut it into pieces of ½ lb or smaller, or put shredded cheese in the freezer right in its bag.
- 2Step 2
Wrap it in plastic and then a freezer bag, pressing the air out.
- 3Step 3
Defrost it in the fridge; the texture turns crumblier, so melt it or cook with it.
Safe ways to defrost parmesan cheese
In the refrigerator
Move it from freezer to fridge the evening before you need it; this preserves the texture best.
On the counter
Suitable only for shelf-stable foods; perishables should never be thawed at room temperature.
Straight from frozen
Plenty of foods can go directly into the oven, a soup, a sauce or a smoothie.
Parmesan cheese left out overnight
After opening, parmesan cheese should live in the fridge. A night at room temperature hastens spoilage, so throw it out if the smell, look or taste seems wrong.
Keeping parmesan cheese in good shape
- Wrap it first in parchment or wax paper, then add a loose layer of plastic so the cheese can breathe.
- Keep it in the cheese drawer or on a low shelf at 40°F (4°C) or colder.
- Cut with a clean knife every time so you don't carry mold spores into it.
What the dates on parmesan cheese packaging mean
Before opening
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.
After opening
The printed date stops counting the moment the seal is broken. Allow 3–4 weeks in the refrigerator, starting on the day you open it.
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.
Parmesan cheese compared with 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
Drawn on the timeline's scale, which runs from 1 hour to 2 years.
Pip can look it up in seconds: find out when leftovers expire and whether something that sat out is still safe to eat.
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.
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