How To Keep Mushrooms Fresh In The Refrigerator

Store mushrooms in a paper bag, not plastic, and keep them in the coldest part of your fridge

Mushrooms stay fresh longest when you store them in a paper bag on a shelf in the back of your refrigerator, where the temperature stays between 32°F and 35°F. Paper lets moisture escape slowly, which prevents the slime and dark spots that come from trapped condensation. Plastic bags trap humidity and speed up decay, so avoid them even though they seem like the obvious choice.

Do not wash mushrooms before storing them. The extra moisture will make them deteriorate faster. Instead, wipe them gently with a dry cloth or paper towel just before you cook them. If you buy mushrooms that are already damp from the store, pat them dry with a paper towel before putting them in the bag.

Most mushroom varieties last 7 to 10 days when stored this way. Cremini and button mushrooms tend to last slightly longer than delicate varieties like oyster or shiitake, which may start to soften after 5 to 7 days. Check them every few days and remove any that show dark spots or slime, because one deteriorating mushroom will speed up decay in the others.

Key Takeaways

• Paper bags work better than plastic because they allow moisture to escape without letting the mushrooms dry out completely.
• Store mushrooms in the coldest part of your refrigerator, usually the back of a shelf rather than the door.
• Do not wash mushrooms before storage; wipe them dry with a cloth instead and wash them just before cooking.
• Remove any mushrooms with dark spots or slime immediately, because decay spreads quickly to nearby mushrooms in the same bag.
• Most varieties last 7 to 10 days, though delicate types like oyster mushrooms may soften after 5 to 7 days.

Why moisture control matters more than cold alone

Mushrooms are about 90 percent water, which means they lose moisture and develop dark spots very quickly in a dry environment, but they also rot fast when water pools around them. The balance is delicate. A paper bag solves this because it absorbs excess moisture from the mushroom surface while still letting the mushroom retain enough water to stay firm. Plastic traps condensation against the mushroom, creating the wet environment where mold and bacterial decay thrive.

If your refrigerator tends to be very dry (some older models are), you can wrap the paper bag loosely in a slightly damp cloth, but do not seal it. The goal is slow, gentle moisture loss, not a sealed environment. Check the mushrooms every two days in this setup, because the cloth can trap too much humidity if the fridge is already humid.

The right shelf location makes a real difference

The back of your refrigerator is colder than the front or the door because cold air sinks and circulates from the back. The door is the warmest part of your fridge—it opens and closes, letting warm air in each time. Mushrooms stored on the door shelf will deteriorate 2 to 3 days faster than those stored in the back. If your fridge has a dedicated vegetable drawer with humidity control, use the low-humidity setting rather than the high-humidity one, because mushrooms need air circulation more than they need moisture retention.

Avoid storing mushrooms directly against the back wall if your fridge has a freezer compartment above it, because that area can get too cold and cause freezing damage. A shelf one or two inches away from the back wall is ideal.

Handling mushrooms before cooking to extend storage

When you bring mushrooms home, open the package and inspect them right away. If they came in a plastic clamshell, transfer them to a paper bag immediately. Leave the stems attached and do not separate mushrooms into smaller piles unless you are cooking them that day—breaking them apart exposes more surface area and speeds up moisture loss and decay.

If you notice a mushroom starting to soften or darken, remove it from the bag and use it that day or discard it. A single deteriorating mushroom releases ethylene gas and moisture that will affect the others. This is especially important with delicate varieties like oyster or shiitake, which can go from firm to unusable in 24 hours once decay starts.

Storing different mushroom varieties

Button and cremini mushrooms are the most forgiving. They last 7 to 10 days in a paper bag and tolerate slight temperature fluctuations. Portobello mushrooms, which are mature cremini, also last 7 to 10 days but develop a stronger smell as they age, so use them sooner if you are sensitive to mushroom odor.

Oyster mushrooms are more delicate and last 5 to 7 days. They bruise easily, so handle them gently and check them every other day. Shiitake mushrooms have a tougher cap but a more delicate stem, and they also last 5 to 7 days. Store them stem-side up in the paper bag so the stem does not get crushed by the weight of other mushrooms.

Enoki and king trumpet mushrooms are specialty varieties that last 4 to 6 days. Enoki mushrooms are especially prone to slime, so check them every two days and remove any that show moisture pooling at the base. King trumpet mushrooms can be stored upright in a small glass or jar with a paper towel at the bottom to absorb excess moisture, which can extend their life by a day or two.

Dealing with mushroom odor in your refrigerator

Mushrooms develop a strong, earthy smell as they age, and this smell can linger in your fridge if mushrooms sit too long. The smell itself is not a sign of spoilage—it is just the natural breakdown of compounds in the mushroom—but it does mean the mushrooms are past their peak. If you notice a strong mushroom smell, check the bag immediately and cook or discard any mushrooms that are soft or slimy.

To prevent odor buildup, store mushrooms in the back of the fridge where air circulation is better, and do not let them sit longer than 10 days. If your fridge already smells like old mushrooms, place an open box of baking soda on a shelf near the mushroom storage area. Baking soda absorbs odors without affecting the taste of nearby foods. Replace it every two weeks or sooner if the smell is strong.

Signs that mushrooms have gone bad

Mushrooms are past their best when they show any of these signs: a slimy or wet surface, dark brown or black spots that feel soft to the touch, a strong ammonia-like smell, or visible mold (usually white or gray fuzz). If only one or two mushrooms in the bag show these signs, remove them and use the rest. If more than half the bag is affected, discard the whole batch—decay spreads quickly once it starts, and the remaining mushrooms will deteriorate within a day or two.

A mushroom that is simply darker or slightly wrinkled but still firm is still safe to eat. Darkening is normal as mushrooms age, and slight wrinkling just means they have lost a little water. Cook these mushrooms soon, but they are not spoiled.

Frequently Asked Questions

Can I freeze mushrooms to make them last longer?

Yes. Slice or chop mushrooms, spread them on a baking sheet, and freeze for 2 to 3 hours until solid, then transfer to a freezer bag. Frozen mushrooms last 8 to 12 months but will be softer when thawed, so they work best in soups, stews, and sauces rather than in dishes where texture matters. Do not thaw them before cooking—add them frozen directly to hot liquid.

Should I remove the stem before storing?

No. Leave stems attached during storage because the cut surface will dry out and the mushroom will deteriorate faster. Remove the stem only when you are ready to cook. For varieties like shiitake where the stem is tough, you can trim it then, but do not remove it days in advance.

What if my mushrooms are slimy but smell okay?

Slime means bacterial growth has started, even if you cannot smell it yet. Discard them. Slime is a sign that moisture has been trapped against the mushroom surface, and the bacteria will continue to multiply. Cooking will not make them safe.

Can I store mushrooms in the vegetable drawer?

Yes, but only if you set the humidity control to low. The vegetable drawer is designed to trap moisture, which is good for leafy greens but bad for mushrooms. A paper bag on a regular shelf is still the better choice, but a low-humidity drawer works if that is your only option.

Do I need to store different mushroom types separately?

It is not necessary, but delicate varieties like oyster or shiitake will last longer if stored separately from heavier button or portobello mushrooms, which can crush them. If you are storing them together, put the delicate ones on top.