Can I Eat Expired Parmesan Cheese?

Last 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

Usually Safe — Depends on Storage & Condition

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.

Low Risk⏱️ Up to 60 days after expiry❄️ Can be frozen

Parmesan Cheese safety depends on more than the date.

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

Fresh Parmesan Cheese

Fresh Parmesan Cheese

⚠️Spoiled Parmesan Cheese

Spoiled Parmesan Cheese
📦

Storage Guidelines

Storage Location

Fridge

Ideal Temperature

4°C (40°F)

Best Storage Method

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.

Shelf Life

Average Shelf Life

365 days

Extended Shelf Life (When Frozen)

730 days

⚠️

Signs of Spoilage

Hard texture, mold (can be cut off), ammonia smell

💡

Transferring opened dairy into an airtight container (Amazon) can reduce odor absorption and moisture exposure.

ℹ️

Additional Information

Alternative Uses

Grate and freeze for later use

Possible Substitutions

Asiago, Romano cheese

Frequently Asked Questions

What's the difference between expiration and best quality dates?

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.

How can I tell if Parmesan Cheese has gone bad?

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.

What are the food safety risks?

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.

What are some pro storage tips?

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.

Any interesting facts about Parmesan Cheese?

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.

How long after opening can I eat Parmesan Cheese?

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.

Can I eat Parmesan Cheese if it's been at room temperature for a few hours?

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.

Does the type of container affect the shelf life of Parmesan Cheese?

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.

Evidence We Use for Parmesan Cheese Guidance

Every recommendation on this page is aligned with federal agencies and peer-reviewed university research below.

USDAOfficial guidance

USDA FoodKeeper – Cold Storage Guidelines

Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.

Visit USDA FoodKeeper
FDAOfficial guidance

FDA Produce Safety Rule & Grower Guidance

Field-to-fridge handling practices that prevent contamination of fruits, vegetables, and leafy greens.

Visit FDA Produce Safety
CDCOfficial guidance

CDC Foodborne Illness Prevention Hub

Surveillance-backed guidance on pathogens, symptoms, and steps to reduce foodborne illness risk.

Visit CDC Food Safety
ResearchUniversity research

UC Davis Postharvest Technology Center

University research detailing optimal storage atmospheres for produce after harvest.

Visit UC Davis Postharvest
ResearchUniversity research

Penn State Extension – Home Food Preservation & Safety

Peer-reviewed extension bulletins on safe canning, chilling, and reheating practices.

Visit Penn State Extension

Important: These are general guidelines based on authoritative sources listed above. Always use your best judgment and when in doubt, throw it out.

Disclosure: As an Amazon Associate, we earn from qualifying purchases. This helps support our site and allows us to continue providing free food safety information.