Do Mushrooms Go Bad or Are They Just Like That?

Do mushrooms go bad? Yes, they do. It can’t be any simpler answering 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. Consequently, if you are worried about the set of umbrella-shaped ingredients in your kitchen somewhere and how long you can keep it, 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 stalk 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 like vegetables too. 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 Mushroom 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 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.

SEE: Do Raisins Go Bad (Or Not)?

Do Mushrooms Go Bad After Cooking?

Yes, they will. Cooked mushrooms go bad faster than uncooked ones. However, refrigerated cooked mushrooms can last up to two weeks before going 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?

Yes, it can. While eating mushrooms 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. It has symptoms like such as vomiting, diarrhea, and heavy breathing. If you experience these, seek medical treatment immediately.

What Is the Shelf Life of Mushrooms?

A raw mushroom lasts for about a week before they start going off. Cooked mushrooms have 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.

SEE: How to Stop Food Spoilage and Food Poisoning

How to Tell 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 touch. Mushrooms are dry and fluffy. Therefore, the first sign a mushroom shows its 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 the mushroom(s) 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. Molds grow when the mushroom is in a moist environment (including fridges) and not properly stored. Mildew is a common bacterium that also grows in these edible fungi.

The only way to keep mold and mildew from going is to seal the mushrooms in a container before freezing or storing them in a cool, dry place.

SEE: Mellow Mushroom Happy Hour

How to Preserve Mushrooms

Freeze them

Yes, it’s better to have your mushrooms frozen than stored. It works best if you want to use the mushrooms over two weeks. Furthermore, freezing mushrooms preserves 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

You can refrigerate your mushrooms by placing them in a Ziploc or paper bag. The bags serve as protection against moisture. The bags prevent them from becoming soggy.

Store in a container

For cooked mushrooms, store them in a resealable bag or airtight container. It also applies to leftover canned mushrooms.

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 your mushrooms whenever you want to use them.

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Is a canned mushroom bad for you?

No, they are not. Canned mushrooms still have 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, they are not. Edible mushrooms are a variety you can eat. They have nutrients that would help your diet. However, not all mushrooms are edible. Some are poisonous or hallucinogenic, while others are nutritious.

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

Why are mushrooms not the same as plants?

Mushrooms do 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 their nutrient and sustain themselves.

Can a bad mushroom be poisonous?

No, it can’t. A bad mushroom is still an edible mushroom. However, it can make you seek. Consequently, you won’t be poisoned if you eat a bad mushroom.


You can use mushrooms in your cooking – edible ones, that is – because of their unique earthy taste. But if you have leftovers, you have to wonder if they can go bad. Well, mushrooms do go bad. However, it varies on what form they’re in.

For fresh, raw ones, they can last between a week to 10 days at most, even refrigerated. Canned ones last as best as written on the packaging. However, throw them in the trash once the date passes. And cooked mushrooms have a day (more if frozen, refrigerated, or dehydrated).

The best way to keep your leftover mushroom is to preserve it properly. Once you have that down, you can be sure to use it over and over again. And when they begin to go off, the telltale signs listed here will guide you.

Thanks for reading.

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