USDA FoodKeeper – Cold Storage Guidelines
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperLast reviewed: January 2026
Reviewed by the Can I Eat Expired Editorial Team using official USDA, FDA, and CDC food safety guidance. How we assess food safety risk
This food is often safe when handled and stored properly, but safety depends on how it's been kept and whether any spoilage signs are present.
⏱️ Safe for up to 60 days after expiry if properly stored and showing no spoilage signs.
Storage temperature, how long it has been opened, and package integrity change the answer — and those details are easy to miss.
Get a yes / no answer for your parmesan cheese →
Check Your Exact Situation

Fridge
4°C (40°F)
Wrap in wax paper and store in fridge drawer
Dairy products require consistent cold storage (40°F or below) to prevent spoilage. A refrigerator thermometer (Amazon) helps ensure your refrigerator maintains safe temperatures.
365 days
730 days
Hard texture, mold (can be cut off), ammonia smell
Transferring opened dairy into an airtight container (Amazon) can reduce odor absorption and moisture exposure.
Grate and freeze for later use
Asiago, Romano cheese
The expiration date on Parmesan cheese indicates the date up to which the cheese is expected to remain at its peak quality. After this date, the flavor and texture may deteriorate, but it does not necessarily mean the cheese is unsafe to eat. Best quality refers to the period during which the cheese is expected to taste its best, but it can still be consumed after this date if properly stored and shows no signs of spoilage. As a hard cheese, Parmesan can last beyond its expiration date if stored correctly.
To check if Parmesan Cheese has gone bad, look for any mold growth on the surface or a darkening in color. Smell the cheese for any sour or unpleasant odors. Lastly, feel the texture - if it feels slimy or sticky, it's best to discard it.
Parmesan cheese is a low moisture cheese with low water activity, which inhibits the growth of harmful bacteria. However, there is still a risk of contamination if not stored properly. To reduce the risk of foodborne illness, always store Parmesan cheese in the refrigerator at temperatures below 40°F (4°C). Avoid keeping it at room temperature for extended periods as this can promote bacterial growth. Additionally, make sure to handle Parmesan cheese with clean hands and utensils to prevent cross-contamination.
To maintain the quality of Parmesan cheese, it is best to store it in airtight packaging or a resealable plastic bag to prevent moisture loss and absorption of other odors. You can also wrap it in parchment paper followed by aluminum foil for additional protection. If the cheese develops mold on the surface, you can cut off the affected part and continue using the rest. For optimal flavor, consider grating Parmesan cheese fresh as needed rather than pre-grating it and storing it for an extended period.
Parmesan cheese, also known as Parmigiano-Reggiano, is a famous Italian cheese that has been produced for over 900 years. It is traditionally made from unpasteurized cow's milk and aged for a minimum of 12 months, with some varieties aged for up to 36 months or more. True Parmigiano-Reggiano can only be produced in certain regions of Italy and must adhere to strict production standards. It is a staple in Italian cuisine, used in dishes like pasta, risotto, and salads.
Once opened, Parmesan Cheese can typically be consumed within 2 to 6 weeks if stored properly in the fridge. Make sure to reseal the packaging tightly or transfer it to an airtight container to maintain freshness.
If Parmesan Cheese has been at room temperature for a few hours, it should still be safe to eat as long as it appears and smells normal. To ensure safety, refrigerate it promptly and consume it within a reasonable time frame.
The type of container can impact the shelf life of Parmesan Cheese. Opt for airtight containers to prevent moisture and odors from affecting the cheese. Proper storage helps maintain its quality and extends its shelf life.
Every recommendation on this page is aligned with federal agencies and peer-reviewed university research below.
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperField-to-fridge handling practices that prevent contamination of fruits, vegetables, and leafy greens.
Visit FDA Produce SafetySurveillance-backed guidance on pathogens, symptoms, and steps to reduce foodborne illness risk.
Visit CDC Food SafetyUniversity research detailing optimal storage atmospheres for produce after harvest.
Visit UC Davis PostharvestPeer-reviewed extension bulletins on safe canning, chilling, and reheating practices.
Visit Penn State ExtensionImportant: These are general guidelines based on authoritative sources listed above. Always use your best judgment and when in doubt, throw it out.
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