Cooked Cheese: How Long Before It's Unsafe To Eat?

Cheese is a versatile and tasty staple in many households. However, it's important to know how long cooked cheese can sit out to ensure food safety and optimal taste. The duration depends on the type of cheese, with soft cheeses like mozzarella and cream cheese being more perishable and prone to spoilage due to their higher moisture content. In contrast, hard cheeses like cheddar and Parmesan can last longer at room temperature because they have lower moisture levels, creating an unfavourable environment for bacterial growth. Additionally, proper storage methods, such as wrapping and refrigeration, play a crucial role in preserving cheese quality and extending its shelf life.

How long can cooked cheese be left out?

Leaving cooked cheese out at room temperature can be risky. Bacteria grow rapidly at temperatures between 40 °F and 140 °F, so cooked cheese should be discarded if left for more than 2 hours at room temperature. To keep yourself safe from bacterial growth or spoilage, only keep cheese out for four hours. However, there has been some research that proves cheese can stay out for up to six hours at 70°F or lower.

Harder cheeses like Parmesan will likely not have microbacterial growth or very insignificant amounts throughout the duration of a party. These cheeses are often hung in Italian markets or cut into pieces on display at grocery stores because they do not require constant refrigeration.

Adam Brock, director of food safety, quality, and regulatory compliance at Dairy Farmers of Wisconsin, states that there is no way to tell if there is bacteria on a piece of cheese by looking because it is microscopic. If your cheese has been sitting out for a while, and you are unsure, it is best to throw it out.

How long does cooked soft cheese last?

Soft cheeses, such as feta, mozzarella, and ricotta, have a shorter shelf life than hard cheeses. This is because they have a higher moisture content, which provides an environment for bacteria to thrive. Therefore, soft cheeses are more perishable and should be consumed within one to two weeks of being opened.

The shelf life of soft cheese is influenced by factors such as the type of cheese, the processing method, the packaging date, its exposure to heat, and how it is stored. For example, soft cheeses sold in brine, like feta or fresh mozzarella, should be kept in the liquid with a secure lid. Soft-ripened or "semi-soft" cheeses like Brie have a delicate rind, so they need more care than other soft cheeses. Wrapping them in cheese paper or parchment paper and keeping them in an airtight container is best.

Opened soft cheeses should be stored in the refrigerator at 40°F or lower immediately after each use. They should be kept in a tightly closed container or wrapped in plastic to keep out moisture and other contaminants. Soft cheeses should not be kept at room temperature for extended periods, as the cheese will quickly degrade as its temperature increases.

Freezing soft cheeses is not recommended, as the texture and consistency will change. However, if you do choose to freeze them, they will last for up to six months in a freezer-safe container at 0°F (-18°C) or below.

How long does cooked hard cheese last?

The shelf life of cooked hard cheese depends on a variety of factors, such as the type of cheese, the processing method, its exposure to heat, how it is stored, and its packaging and sell-by date.

Hard cheeses like Cheddar, Parmesan, and Gouda have a lower moisture content, which helps extend their shelf life. Generally, hard cheeses will last three to four times longer than soft cheeses in the fridge, as they contain less moisture and are therefore less prone to spoilage from bacteria.

Hard cheeses that haven't been opened can last for several months and even up to a year when stored in the fridge. Once opened, hard cheeses can last for a few weeks to a couple of months in the refrigerator. It is important to store hard cheeses in an airtight container or wrapped tightly in the coldest part of the fridge.

If mold forms on hard cheeses, simply cut it off and continue using the cheese. Hard cheeses can also be frozen to extend their shelf life.

How to store cooked cheese

Storing cooked cheese is a little different from storing regular cheese. Here are some tips to help you keep your cooked cheese fresh and tasty:

• Choose the right storage container: Select an airtight container made of glass or plastic with a tight-fitting lid. This will help keep moisture in and prevent the cheese from drying out.
• Line the container: Before placing the cooked cheese in the container, line it with a piece of wax paper, parchment paper, or cheese paper. This will help absorb any excess moisture and prevent the cheese from becoming soggy.
• Add a little brine: If your cooked cheese is a soft variety, such as ricotta or mozzarella, you can add a small amount of brine (saltwater) to the container. This will help keep the cheese moist and flavourful. Change the brine every few days, or if it becomes contaminated.
• Store in the fridge: Place the container of cooked cheese in the refrigerator, preferably in the crisper drawer, where the temperature is more consistent and humid. Cooked cheese should be consumed within a few days, so there is no need to worry about long-term storage.
• Label and date: Always label your container with the type of cheese and the date it was cooked. This will help you keep track of how long it has been stored and ensure you consume it within a safe timeframe.
• Handle with clean utensils: When serving or using the cooked cheese, always use clean utensils to prevent contamination. Never dip your fingers directly into the container, as this can introduce bacteria and cause the cheese to spoil faster.
• Reheat gently: If you need to reheat your cooked cheese, do so gently and avoid overheating. Microwaving is generally not recommended, as it can cause the cheese to become tough and rubbery. Instead, use a low heat setting on the stovetop or oven.
• Consume promptly: Cooked cheese is best enjoyed fresh. While storing it in the fridge can extend its lifespan, it is still perishable and should be consumed within a few days. Do not leave cooked cheese at room temperature for more than two hours to prevent bacterial growth.
• Check for spoilage: Before consuming cooked cheese, always check for signs of spoilage. If the cheese has developed an off odour, unusual discolouration, or visible mould, discard it immediately. Do not taste the cheese to determine if it is safe, as even a small amount of contaminated cheese can cause foodborne illness.
• Consider freezing: If you have a large batch of cooked cheese and know you won't consume it within a few days, consider freezing it. Wrap the cheese tightly in plastic wrap, then place it in a freezer-safe bag or container. Label and date it, then transfer it to the freezer, where it will keep for up to two months. Thaw frozen cooked cheese overnight in the refrigerator before consuming.

How to tell if cooked cheese has gone bad

The length of time cooked cheese lasts depends on the type of cheese. Soft cheeses tend to spoil more quickly than hard cheeses. In general, soft cheese will last up to one week in the fridge, while hard cheese can last up to four weeks. However, it's important to note that cooked cheese may not last as long as uncooked cheese.

• Expiration date: Always check the "best by" or expiration date on the packaging. It's best not to consume cheese past this date.
• Appearance: Changes in the appearance of the cheese can indicate spoilage. This includes the development of different colours, such as a hard cheese like cheddar or parmesan turning dark. The presence of abnormal mould is also a sign of spoilage. For hard cheeses, you can cut off the mouldy part and consume the rest. However, for soft cheeses, shredded, or sliced cheeses, it is recommended to discard the entire product if mould is present.
• Smell: If the cheese has an ammonia-like, sour, or otherwise unpleasant odour, it has likely gone bad.
• Texture: Spoiled cheese may feel different when sliced, such as crumbly, mushy, or very dry.
• Taste: An unintentional bitter flavour, fermented fruit taste, or a fizzy sensation on the tongue are signs that the cheese has gone bad.

Consuming spoiled cheese can lead to food poisoning, so it is important to be cautious and discard the cheese if you have any doubts about its freshness.

Frequently asked questions