There’s a specific little tragedy that happens in the bottom of the fridge. You buy a nice punnet of mushrooms, full of plans for risotto or a good fry-up, and a few days later you find them again. Slick. Slimy. Faintly sticky, with a smell that’s drifted from earthy toward off. Straight in the trash, along with the risotto dream. I did this on repeat for years.
What I didn’t understand is that mushrooms are basically sponges with an image problem. They soak up moisture, they give off moisture, and they need to breathe, all at once. Store them the way most of us instinctively do, sealed in plastic in a damp fridge drawer, and you’ve built the perfect slime machine. Change one small thing and they stay firm and fresh for the better part of a week.
The good news is that the fix is almost laughably cheap and simple. No gadgets, no special containers. Just a paper bag and a couple of habits. Once I switched, slimy mushrooms basically vanished from my life.
So let me hand you the fix. Here’s how I store mushrooms now, whole and sliced, button and fancy, so they stay dry, firm, and usable instead of turning into that sad slippery mess in the drawer.
[IMAGE: Fresh button and cremini mushrooms in a folded paper bag in the fridge]
So, How Do You Actually Store Mushrooms?
The short answer to how to store mushrooms is to keep them somewhere cold, in something that breathes, and bone dry until the moment you cook them. That’s the whole thing. Cold, breathable, and dry.
In practice, the best everyday method is a paper bag in the fridge. The paper absorbs the excess moisture mushrooms naturally give off, while still letting air move around them, so they don’t sweat and slime the way they do in plastic. And you leave them unwashed until you’re ready to use them, because added water is exactly what starts the slide toward slimy.
So whenever you’re deciding what to do with a batch of mushrooms, think dry and breathing. Not sealed in plastic, not rinsed and damp. Cold, in paper, and dry until go time. Everything below is just the useful detail on top of that.
Why Mushrooms Get Slimy (and Sometimes Shrivel)
Understanding what actually goes wrong made all of this make sense to me, and, like a lot of produce, mushrooms can fail in two opposite directions.
Slime is the wet failure, and it’s the common one. Mushrooms are mostly water and they keep releasing moisture as they sit. Trap that moisture against them, in a sealed plastic punnet or a zipped bag, and it has nowhere to go. It pools on the surface, bacteria get to work, and you get that slippery, sticky film. Excess moisture is the number one enemy of a good mushroom.
Shriveling is the dry failure, less common but real. Leave mushrooms totally exposed in dry fridge air for too long and they lose their own moisture, going wrinkly, leathery, and light. Not as gross as slime, but past their best.
So you’re after a middle path, and it’s exactly what a paper bag delivers. The paper wicks away the surplus moisture that causes slime, while slowing the total moisture loss that causes shriveling, and the fridge keeps everything cold so it all happens slowly. That balance is the whole game.
The Paper Bag Trick That Changes Everything
If you take one thing from this article, make it this. Store your mushrooms in a paper bag in the fridge. That’s the trick, and it’s genuinely transformative.
Here’s why it works so well. Paper is breathable and mildly absorbent. It soaks up the moisture the mushrooms release, keeping their surfaces dry, and it lets air circulate instead of trapping humidity against them. The result is mushrooms that stay firm and dry rather than sweating themselves slimy. Fold the top of the bag over loosely to keep them from drying out too much, and tuck the bag in the fridge, ideally in the main body rather than buried in the dampest corner of the crisper.
A plain brown paper lunch bag is perfect. If you buy loose mushrooms, just bag them up when you get home. If your mushrooms came in a plastic punnet, tip them into a paper bag instead, or at the very least open up the plastic. This one swap, from plastic to paper, is the single biggest upgrade you can make to how long your mushrooms last.
Ditch the Plastic
Let’s be blunt about the villain here. Sealed plastic is what’s killing your mushrooms. That shrink-wrapped punnet they often come in is fine for the shop and the journey home, but it’s a sweatbox for storage. The plastic traps every bit of moisture the mushrooms give off, and slime follows fast.
So when you get mushrooms home, don’t just toss the sealed punnet in the fridge and forget it. Either move the mushrooms into a paper bag, or, if you want to keep the punnet, peel back the plastic film and lay a paper towel over the top to catch moisture. Anything that breaks the airtight seal and gives them some airflow helps.
It feels counterintuitive, because we’re trained to think airtight equals fresh. For a lot of foods, sure. For mushrooms, airtight equals slimy. They’re one of the few things in your kitchen that genuinely want to breathe, so let them.
Don’t Wash Them Until You’re Ready
This one trips up almost everyone, because washing feels responsible. With mushrooms, washing before storing is a fast track to slime. They soak up water like the sponges they are, and any moisture you add before storage just accelerates the sliminess and rot.
So store mushrooms unwashed and dirty, and only clean them right before you cook. When you do clean them, go gentle. Wipe them with a damp paper towel or a soft brush to knock off any dirt, or give them a very quick rinse and pat them dry immediately if they’re really gritty. Don’t let them sit and soak in a bowl of water, they’ll drink it in and go soggy.
Yes, you’ll hear endless debate about whether washing mushrooms ruins them. For storage the answer is clear, keep them dry until use. Whatever cleaning they need can happen in the thirty seconds before they hit the pan.
[IMAGE: A mushroom being gently wiped clean with a damp cloth just before cooking]
Whole vs. Sliced Mushrooms
How you’ve cut them changes how they keep, so a quick word on this.
Whole mushrooms last longest. With less cut surface exposed to air, they hold their moisture and firmness better and resist both slime and discoloration. So whenever you can, store mushrooms whole and slice them only when you’re about to cook.
Sliced mushrooms are more delicate. All those cut faces are exposed, so they dry out, darken, and spoil faster. If you buy pre-sliced mushrooms, or slice more than you need, keep them in a paper bag or a paper-towel-lined container in the fridge and use them within a couple of days. A little browning on cut surfaces is usually just oxidation and fine to cook, but slime and a sour smell mean they’re done.
The rule of thumb is the same as with a lot of produce, the more intact you keep them, the longer they last. Cut only what you need, when you need it.
Storing Different Kinds of Mushrooms
Most mushrooms follow the same paper-bag rule, but they don’t all last the same.
Common cultivated types, white button, cremini, and portobello, are the sturdy everyday mushrooms, and they keep well in a paper bag in the fridge for around a week. These are the reliable ones.
Delicate varieties like oyster, enoki, and shiitake tend to be more perishable and want using sooner, often within a few days. Store them the same way, paper and cold, but keep a closer eye and eat them first. Enoki and other very thin, moist mushrooms slime especially fast, so don’t let them linger.
And a genuine safety note on wild mushrooms. If you forage, correct identification is a matter of real safety, not just storage, since some wild mushrooms are seriously toxic. This article is about storing the edible mushrooms you’ve bought or confidently identified, so leave foraging identification to expert guidance and never eat a wild mushroom you’re not completely certain about.
Can You Freeze Mushrooms?
Yes, and it’s a great way to rescue a batch you can’t get through, with one tip that makes all the difference. Don’t freeze them raw and whole if you can help it. Because they’re so full of water, raw mushrooms freeze into a watery, mushy texture when thawed.
The better way is to cook them first. Saute the mushrooms in a dry or lightly oiled pan until they release their water and firm up, let them cool, then freeze them flat in an airtight bag. Cooked-then-frozen mushrooms keep a much nicer texture and drop straight into sauces, omelets, soups, and pasta. You can also freeze them raw and sliced purely for cooking if you’re short on time, just accept a softer result. Some people steam-blanch them first, which helps too.
Anything you freeze does best in a freezer that’s genuinely cold, sitting at the right freezer temperature of 0°F. Frozen mushrooms keep their quality for several months and are always destined for cooking, never for raw use. So saute, cool, bag, freeze, and future you has a shortcut waiting.
Drying Mushrooms for Long Storage
If you want to keep mushrooms for the really long haul, drying is the classic answer, and dried mushrooms are a genuinely useful thing to have in the cupboard. Dried, they last for months, sometimes a year or more, and they pack an intense, concentrated flavor that’s wonderful in stocks, risottos, and sauces.
You can dry mushrooms in a dehydrator, in a low oven, or even by stringing them up in a dry, airy spot for hardier varieties. However you do it, they need to be dried until completely crisp, with no moisture left, then stored in an airtight jar somewhere cool and dark. Any leftover moisture invites mold, so “bone dry” is the standard here.
To use them, just soak dried mushrooms in warm water until they plump up, and save that soaking liquid, it’s liquid gold for adding depth to whatever you’re cooking. It’s a different way of keeping mushrooms than the fridge, but a brilliant one for anyone who cooks with them often.
How to Tell When Mushrooms Have Gone Bad
Mushrooms usually signal clearly when they’re done, so here’s what to check.
Sliminess is the big one, that slippery, sticky film on the surface means it’s time to let them go. A sour, unpleasant, or fishy smell, rather than a clean earthy one, is another clear sign. So are dark, soft, mushy spots, any fuzzy mold, and a generally wet, deteriorated look.
Some changes are fine, though. A little surface browning or slight wrinkling on otherwise firm, dry mushrooms usually just means they’re aging and are still perfectly good cooked, use them soon. It’s the combination of slime, softness, dark wet patches, and a bad smell that says throw them out. When you’re genuinely unsure, trust your nose, mushrooms that have turned really do smell wrong, and it’s not worth the gamble to cook them.
The Mistakes That Cost Me the Most Mushrooms
Every one of these has cost me a batch, so save yourself the slime.
Leaving them sealed in the plastic punnet. The classic killer. Trapped moisture equals slime. Move them to a paper bag or at least open the plastic.
Washing them before storing. Added water is exactly what you don’t want. Store them dry and dirty, clean them right before cooking.
Soaking them to clean them. They drink it in and go soggy. Wipe with a damp cloth or brush instead, or rinse quickly and dry at once.
Storing them in an airtight container. Mushrooms need to breathe. Airtight traps the moisture and slimes them. Paper and airflow, not a sealed box.
Freezing them raw and whole. They turn watery and mushy. Saute first, then freeze, for a far better result.
How Long Do Mushrooms Actually Keep?
Here’s the rough map I keep in my head, though the type and storage shift things around.
Common whole mushrooms, button, cremini, and portobello, kept in a paper bag in the fridge, generally stay good for about a week. Sliced mushrooms are shorter, more like a couple of days, because of all that exposed cut surface. Delicate varieties like oyster and enoki also lean toward just a few days. Cooked-then-frozen mushrooms hold their quality for several months, and properly dried mushrooms keep for many months to a year or more in an airtight jar.
These are ranges, not guarantees, since your fridge temperature, how the mushrooms were stored before you bought them, and their freshness on day one all move the numbers. That variability is exactly why official sources like the USDA’s FoodKeeper guidance give storage windows rather than exact dates check current produce storage times{:rel=”nofollow”}. Treat them as planning guides, then let a firm feel and a clean earthy smell settle the close calls. Dry and firm is good. Slimy and sour is not.
Where in the Fridge Should Mushrooms Go?
People assume mushrooms belong in the crisper drawer with the rest of the vegetables, and honestly that’s often the worst spot for them. The crisper is designed to hold in humidity, which is exactly what leafy greens want and exactly what mushrooms don’t. Extra humidity plus mushrooms equals a faster slide toward slime.
So I keep my paper bag of mushrooms on a regular fridge shelf instead, in the main body where the air is a little drier and steadier. If you’d rather use the crisper, and it has a humidity slider, set it toward the low or drier end for mushrooms, the opposite of what you’d do for lettuce and leafy greens. That small tweak keeps the environment on the dry side they prefer.
A couple of other placement notes. Don’t wedge mushrooms right at the back of the fridge where things sometimes freeze, since a semi-frozen mushroom turns mushy when it thaws. And don’t bury the bag under a pile of heavy items, because mushrooms bruise easily, and bruised spots break down and darken faster. Give them a calm, slightly dry, uncrushed corner and they’ll reward you.
It’s a small thing, but matching the spot to the food matters. Greens want the humid drawer. Mushrooms want the drier shelf. Once I started thinking that way, a lot of my fridge waste quietly disappeared.
My Honest Take
Mushrooms went from something I threw away half of to something I reliably use up, and the entire fix cost me a paper bag. I stopped storing them in plastic, started keeping them in paper in the fridge, and quit washing them until the moment they hit the pan. That’s genuinely all it took, and the slimy-drawer tragedy just stopped happening.
If I could tell my past self one thing, it’d be to bin the plastic immediately. I spent years blaming the mushrooms for going slimy when it was the sealed punnet doing it every single time. Move them to paper and they breathe, they stay dry, and they last. Such a tiny change for such a big difference.
Nothing here is high-stakes with store-bought mushrooms, thankfully, the worst outcome is usually a wasted punnet rather than anything that’ll harm you. The one real exception is wild mushrooms, where identification is a genuine safety matter best left to experts. For the everyday kind, trust your senses, slime and a sour smell mean toss them, and keep them cold, dry, and breathing to enjoy far more of what you buy.
FAQ
What’s the best way to store mushrooms?
Keep them in a paper bag in the fridge. The paper absorbs the moisture mushrooms release while letting air circulate, so they stay dry and firm instead of turning slimy. Leave them unwashed until you’re ready to cook, and store them whole when you can, since whole mushrooms last longer than sliced.
Why do my mushrooms get slimy?
Slime comes from trapped moisture. Mushrooms release water as they sit, and when they’re sealed in plastic with no airflow, that moisture pools on the surface and turns them slippery. Storing them in a breathable paper bag and keeping them unwashed until use prevents most sliminess.
Should you store mushrooms in plastic or paper?
Paper, every time. Sealed plastic traps humidity and slimes mushrooms fast, while a paper bag absorbs excess moisture and lets them breathe. If your mushrooms came in a plastic punnet, move them to a paper bag or at least open the plastic and lay a paper towel on top.
Should you wash mushrooms before storing them?
No. Washing adds moisture, which speeds up sliming and rot. Store mushrooms dry and unwashed, then clean them right before cooking by wiping with a damp cloth or brush, or with a very quick rinse and an immediate pat dry. Never soak them.
Can you freeze mushrooms?
Yes, but they freeze best cooked rather than raw, since raw mushrooms turn watery and mushy. Saute them until they release their moisture, cool them, then freeze flat in an airtight bag. Frozen mushrooms keep their quality for several months and are used for cooking, not raw.
How long do mushrooms last in the fridge?
Whole button, cremini, and portobello mushrooms kept in a paper bag last about a week. Sliced mushrooms last a couple of days, and delicate types like oyster and enoki just a few days. Storing them dry, cold, and breathing gets you the longer end of those ranges.
How can you tell if mushrooms have gone bad?
Toss them if they’re slimy or sticky, smell sour or off rather than earthy, or have dark mushy spots or mold. Slight browning or minor wrinkling on firm, dry mushrooms is just aging and fine to cook soon. When in doubt, trust your nose, spoiled mushrooms smell clearly wrong.
Conclusion
So, how do you store mushrooms without them getting slimy? Keep them cold, keep them breathing, and keep them dry. A paper bag in the fridge does almost all the work, absorbing the moisture that causes slime while letting air move. Leave them unwashed until you cook, store them whole when you can, and match your timing to the type, common mushrooms last about a week, delicate ones just a few days. Freeze the extras cooked, or dry them for the long haul.
Here’s your one thing to do today. Go rescue whatever mushrooms are currently suffocating in plastic in your fridge, tip them into a plain paper bag, fold the top over loosely, and put them back. That single swap, from plastic to paper, is the whole reason my mushrooms stopped going slimy. Try it with your next punnet and you’ll see the difference by the end of the week.
About the Author
Muazzam Ali is the food-storage writer behind HealthAndFoodGuide.com, where more than a decade of kitchen experimenting has gone into a single stubborn goal, throwing away less of what we buy. Mushrooms, with their sponge-like love of moisture and their oddly specific need to breathe, are one of his favorite examples of how the right small habit beats any fancy gadget.
Disclaimer: This mushroom-storage advice draws on years of hands-on kitchen experience and general food-handling best practices, and is meant for everyday information only, not professional dietary or food-safety guidance. It covers cultivated, store-bought mushrooms, identifying wild or foraged mushrooms is a serious safety matter best left to experts. When you’re unsure whether any food is still safe, follow official guidance from bodies like the USDA or FDA, or simply throw it out.