Do Mushrooms Go Bad Or Are They Just Like That?

Do mushrooms go bad? Yes, they do. It can’t be any simpler to answer this question. The unique food ingredient helps in toning the flavor of your food, giving it a natural fluffy taste. That’s why you find them in kitchens.

They are shaped differently; nonetheless, they do go off. If you are worried about the set of umbrella-shaped ingredients in your kitchen somewhere and how long you can keep them, you are in the right place.

A mushroom will go bad over time. So if you have this cutely-shaped food that isn’t a plant or animal stored somewhere, you should know this.

What are mushrooms?

Mushrooms are edible and made of joined spores that form through fungi’s reproductive structure. Therefore, mushrooms are basically fungi.

They grow differently from plants, growing around the food source rather than making food through photosynthesis.

Also, the non-plant edibles have long stalks with an umbrella-like shape called the cap. The gills are below the cap; they are the fleshy part of a mushroom.

However, not all mushrooms look like this. There are different shapes, colors, and sizes of mushrooms.

Nonetheless, what you should be most familiar with are edible mushrooms. They are non-poisonous and used in cooking and for medicinal purposes.

Do mushrooms go bad fast?

Yes, mushrooms go bad fast as vegetables do. If not stored properly, your mushroom will likely go bad fast from exposure to bacteria, water, or contaminated air.

Consequently, preserving your mushroom properly saves it from going bad fast.

Can mushrooms go bad in the fridge?

Yes, it can. A mushroom can turn mushy or slimy if kept in the fridge for too long. You can keep mushrooms in the fridge for up to two weeks before it starts to show signs of going off.

Furthermore, cooked mushrooms last longer than raw mushrooms in the fridge. If you have raw mushrooms in your fridge, it is best you use them or boil them and keep them to make them last longer.

Does a canned mushroom go bad?

Yes, a canned mushroom can go bad. Processed foods in cans can go bad after their shelf life. However, they last longer than their refrigerated counterparts.

Additionally, some canned mushrooms have preservatives to enhance their longevity. While this may affect the nutrients, it will provide longer-lasting options.

Do mushrooms go bad after cooking?

Yes, they will. A mushroom dish will go bad faster than the raw one. However, refrigerating the dish can make it last up to two weeks before it goes off.

Do raw mushrooms go bad in a week?

Yes, it can. A mushroom can go bad in a week if left unpreserved. To avoid this, store your mushrooms properly or cook them before it goes bad.

Can bad mushrooms make you sick?

While eating mushrooms that have gone off will not lead to serious side effects, it will make you sick. It can lead to slight stomach upset, but not enough to land you in the ER.

However, there are rare cases where bad mushrooms could lead to food poisoning called botulism.

Symptoms include vomiting, diarrhea, and heavy breathing. If you experience any of these, seek medical treatment immediately.

What is the shelf life of mushrooms?

A raw mushroom can last for about a week before it goes off. A mushroom dish will last a day or two. However, it can last for up to two weeks if refrigerated.

Meanwhile, canned mushrooms can last for a year or the date provided on the packaging. Nonetheless, unopened canned mushrooms last for a day or two if left without preserving them.

How to tell a mushroom is bad

It becomes slimy

It is the first sign your mushrooms have gone off. The texture starts emitting goo that feels slimy to the touch. Mushrooms are dry and fluffy. Therefore, the first sign a mushroom shows it has gone off is the slimy texture.

The appearance of dark spots

Another way to tell your mushrooms have gone bad is dark spots. A good mushroom is clear.

However, when it oxidizes, the color begins to fade. Being exposed for too long brings out the dark spots, which start with little dots until it completely covers the mushrooms.

Note: mushrooms stored in the fridge can also spot, so be on the lookout.

It shrinks

A mushroom shrinks in size when it starts to go bad. The water content in a mushroom starts to evaporate, which leads to wrinkles and shrinkage.

A dry, dehydrated mushroom has lost its water content. Therefore, avoid buying such at the food market.

It smells

A mushroom going bad has a strong off-putting odor, a contrast to the earthy, soft smell it’s known for.

The smell gradually shifts from a light earthy tone to a stronger one. If you notice the smell, it’s best to throw them away.

Becomes darker

Not only do dark spots appear on a bad mushroom, but the color also changes shades from its off-white shade to brown, dark brown, then black.

Molds grow

Another telltale sign you are breeding bad mushrooms is molding. Mold grows when the mushroom has been in a moist environment (including fridges) and is not properly stored.

Mildew is another common bacterium that also grows on mushroom. The only way to keep mold and mildew away is to seal the mushrooms in a container before freezing or storing them in a cool, dry place.

How to preserve mushroom

Freeze them

Yes, it’s better to keep mushrooms frozen than stored fresh. It works best if you want to use them over two weeks. Furthermore, freezing helps to preserve the water in them.

However, it’s best you freeze cooked or sautéed mushrooms than raw ones. Raw mushrooms may likely become soggy when thawed.

Refrigerate them

Refrigerate the mushroom, raw or cooked, in a Ziploc or paper bag. The bags serve as protection against moisture. The bags prevent them from becoming soggy.

Store in a container

Store your mushroom dish in a resealable bag or airtight container. It also applies to leftover canned mushroom.

Use a food dehydrator

Drying your mushroom with a food dehydrator or oven preserves them longer. After drying them, place them in an airtight container and store them. You can always rehydrate the mushroom whenever you want to use it.


Is a canned mushroom bad for you?

No, it is not. Canned mushroom has all the nutrients that would improve your diet. They contain vitamins (especially B vitamins), potassium, copper, and phosphorus that help you.

However, be sure the canned mushroom does not have harmful preservatives.

Are all mushrooms edible?

No, not all mushroom is edible. While some varieties make great meals, some of them are poisonous or hallucinogenic.

Nonetheless, edibles are different, and you will find them sold in markets and fresh food stores.

Why is a mushroom not a plant?

A mushroom does not have seeds or flowers like plants. They belong to the family of heterotrophs, which are fungi that rely on their environment.

They grow around the source of their nutrient. Meanwhile, a plant can create its nutrient and sustain itself.


You can use mushrooms in your cooking – edible ones, that is – because of their unique earthy taste. But if you don’t use up the leftovers quickly, they will go bad. However, it varies with the form they were in before storage.

The fresh, raw ones can last between a week to 10 days at most. Raw mushrooms will last longer when you freeze them.

The canned varieties are as good as their printed date. A mushroom dish has a day (more if frozen, refrigerated, or dehydrated).

Most importantly, always examine them, raw or cooked, for signs of spoilage.

Thanks for reading.

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