How Long Mushrooms Last And How To Increase Their Shelf Life


​How Long Do Mushrooms Last after purchase?

When I go grocery shopping, I like to plan out many meals in advance. When you do this, you can stock up on many different items. I understand that the self-life of many of these items can be a concern when buying in advance.

Mushrooms are one healthy item that often find their way into my shopping cart. They are a versatile and delicious food that can bring new flavors and textures to your cooking.

I know it can be frustrating when the ingredients go bad before you have had a chance to use them. When planning out meals you have to be aware how long the mushroom will last in your refrigerator, so I am going to tell you how long you can expect mushrooms to be fresh before turning bad.


​How long do mushrooms last? How long are mushrooms good for?

If you wondered how long are mushrooms good for, you should know that on average a mushroom that you buy from the store will last about two weeks if regenerated. Depending on how long they have been on the store shelf this may be even sooner, though your chances of mushrooms going bad increases significantly around the two-week mark. This two-week window assumes you will be storing the mushrooms in a refrigerator.

There are some factors that can change this two-week window. I like whole mushrooms, and whole mushrooms will likely last for the entire two weeks, but a sliced mushroom has been exposed and the timeline may be cut down by about half. The reasoning behind this is that whole mushrooms have a less exposed surface area. By slicing up the mushroom, you are increasing the area exposed to the elements that make them go bad.


​Credit: Cooking the Prawn


​How do I know if my mushrooms have gone bad?

Well, your first test should be a sight test. You can gain a lot of information by just taking a look at the mushroom. Bad mushrooms grow dark spots. These dark spots are the first sign that a mushroom is starting to go south, and it will not be long until they are unsafe.

Keep a close eye on the shade of your mushrooms and take note when they start to darken. If I notice my mushroom star to develop these spots, I use them right away. They may still be safe if you catch the color change quickly enough.


​Credit: Delishably

Your other senses can also help out to suss out if your fungus is bogus. If a sight test is inconclusive, give your mushrooms a sniff test. If they smell funny or strange, then they may have just gone bad. I have found there is a large difference between the small of fresh mushrooms and ones that have gone bad. Fresh mushrooms should not give off much of an odor, and the smell given off by a fresh and safe mushroom will be subtle and light. If I smell a strong odor as I open a container, I throw them out.

If all else fails, give them a poke. Mushrooms that have gone bad will become slimy. A slimy mushroom is a positive indicator that a mushroom is dangerous to eat. Any slimy mushrooms should be tossed away immediately.


​Mushroom Shelf Life

​Sometimes a mushroom will not get slimy, but will dry out and wrinkle instead. Wrinkles are visible indicators of mushrooms shelf life deterioration. I know there are some techniques to dry out mushrooms, but be careful as to when they start to wrinkle on their own, at which point they are no longer safe to consume.


​Credit: Food One How To

​If any of these tests provide results, your mushrooms may be bad and you may be safer steering clear of that batch. In the end, it is up to your best judgment. These tests can help give you an idea of when things have turned sour, but since bad mushrooms can make you sick, err on the side of caution.


​How do I lengthen the life of my mushrooms?

To prevent premature spoiling of your mushrooms, you will have to store them properly. There are ways to store them that will even elongate their shelf life.

First and foremost, I suggest you let your fresh mushrooms breathe. I use a paper bag, which is a wonderful container for fungi as it will let in the right amount of air. If you bought the mushrooms in a shrink wrapped container, you usually can just leave them in your refrigerator in that packaging until you are ready to use them.

If you see your mushrooms starting to head in a bad direction, you can brown them up in a pan with some oil which will extend their life by a few days. After browning put them in a suitable container and place them back in the refrigerator. I like to do this anyway, as it saves me the mushroom cooking step when I get around to putting a dish together.


​Credit: Sybaritica

Another way to extend their shelf life is by freezing. This can be a bit more tricky than freezing other ingredients, though, as mushrooms retain much more water than other foods that you may freeze. To properly freeze raw mushrooms you will want to place them on parchment paper and in an airtight bag. Press as much air out of the bag as you can before sealing.

It is risky and difficult to properly freeze raw mushrooms, so I recommend cooking them before freezing. If you blanch, saute, or steam the mushrooms, place them into an airtight container and then freeze them to significantly extend their life. Once frozen, mushrooms should last up to a month.


​Better safe than sorry . . .

Mushrooms can typically last two weeks refrigerated. Sliced mushrooms will go bad faster than whole mushrooms.

To tell if your mushrooms have gone bad, look out for the warning signs:

  • ​Dark spots
  • Strong odor
  • ​Slimy
  • ​Wrinkles

At first sight of dark spots, the mushrooms are starting to turn. They may still be saveable if cooked or used right away. If they have gotten to a point where they are slimy or smelly, they are dangerous to consume and should be thrown away.

If you want to increase the shelf life of your mushrooms, there are a few things you can do.

  • Keep refrigerated in a proper container
  • Freeze
  • ​Cook them when they first show signs of dark spots.

We’ve already mentioned that mushrooms can last up to two weeks. We’ve also given you tips on how to know when you should toss them, and a few ideas on how to extend their shelf life.

Dehydrating Mushrooms for Extended Shelf Life

However, there’s another way you can keep mushrooms for a lot longer.  All you need to do is dehydrate your excess mushrooms, and you’ll have a ready supply to pop into your favorite dishes whenever you need them.

The Shelf Life of Dried Mushrooms

Food goes bad because of its moisture content. Bacteria and germs don’t do well when you suck out every drop of moisture from produce, which is why dried foods can have an incredibly long shelf life. 

Properly dehydrated mushrooms can last for up to 12 months in the fridge or freezer. If you don’t use them regularly, it’s a good idea to label them with the date.

Simple Mushroom Dehydration

If you’ve got a small batch of mushrooms, drying them out for later use is easy, and doesn’t require any extra equipment other than a baking tray and baking paper.

Fungus. Mushrooms on the table

First, slice the mushrooms, then layer them over baking paper on a tray. Cover them with a paper towel or napkin to protect them from dust, while making sure there is plenty of airflow over them. Then set them down somewhere out of the way.

The process takes about two weeks, but check the mushrooms’ progress periodically. If they’re still a little spongy, then leave them for a little longer. Your mushrooms are ready when they feel dry, but have a small amount of flex in them. Put them in an airtight bag or mason jar and store them in the freezer. Make sure you label them with the date.

Mushrooms in a glass jar on a black background with copy space, top view. The concept of homemade blanks. Place for your text.

A Faster Way to Dry Mushrooms

If you don’t like the idea of mushrooms out in the open for so long, then you will get good results when using your oven to dry them.

Thoroughly clean the mushrooms, and don’t worry about them soaking up too much water. They won’t, and you want to make sure they’re entirely free of dirt. Use a soft-bristled brush if necessary.

Next, you will need to slice the mushrooms into 1/8 to a ¼ inch thick slices. Not too thick, because they will take longer to dry and you don’t want them taking over your oven for longer than necessary.

Remove any excess water by spreading the mushrooms on a clean dish towel. Loosely roll the mushrooms up into the cloth and give the bundle a gentle squeeze to ensure you soak up all the moisture.  You don’t want wet mushrooms in the oven because that will steam them, rather than dry them. Arrange the mushroom slices on a baking sheet while making sure none of the pieces overlaps or touches.

You will need an oven that goes down to 150 F (65 C). Place the mushrooms into the preheated oven for about an hour. Turn them over and give them another hour.

Check for dryness by taking them out of the oven and letting them cool. Return the mushrooms to the oven for another 30 minutes if they are not crispy dry after cooling.  

Using Dried Mushrooms in Cooking

You will need to rehydrate your mushrooms before using them in your recipes. Put them in a heatproof bowl and cover them with boiling water. After about 30-minutes of soaking, you will be able to use the mushrooms as per usual. Drain and keep the water, as you can use it to add a rich earthy flavor to stocks and soups.

Helen Harris

Helen’s your eternally cheerful, next-door suburban mom that genuinely enjoys sharing with the whole neighborhood her latest fresh-from-the-oven culinary creations. She’s also a treasure trove of kitchen hacks and DIY advice if you have the patience to listen to her life story on repeat and the latest news on her son, Marv, and on how great he’s doing on the college football team. Fortunately, she agreed to leave her kitchen wisdom in writing as well when one of our editors with saintlike patience asked her to.

Click Here to Leave a Comment Below 4 comments
Lita Watson - June 18, 2017

When you start preserving your mushrooms, you had better avoid storing them near any type of food that has a really strong smell or flavor.They will absorb them right then and there.

    Booker Swapp - July 4, 2020

    I used to be able to find good advice from your content.

    Free Stuff - July 7, 2020

    Hello.This article was really fascinating, particularly since I was browsing for thoughts on this topic last Friday.

hasan kashani - March 14, 2019

Dear sirs misses

good morning

regarding the commercial producers of white mushroom , what are the most efficient way to extend the shelf life ???? please advice .

Mushroom Research Institute /

Hasan kashani


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