Freshly harvested mushrooms can have better flavour and texture than mushrooms that have spent days travelling and sitting on a supermarket shelf.
However, mushrooms also contain a lot of moisture.
When they are stored incorrectly, that moisture can become trapped around them, causing the mushrooms to soften, darken and become slimy.
The best way to store fresh mushrooms is simple:
Keep them refrigerated, dry and able to breathe.
For most fresh gourmet mushrooms, a paper bag or breathable container is better than a tightly sealed plastic bag.
This guide explains:
- The best way to store fresh mushrooms
- Why mushrooms become slimy
- Whether mushrooms should be washed before storage
- How long fresh mushrooms last in the fridge
- How storage differs between mushroom species
- How to store home-grown mushrooms after harvest
- How to recognise mushrooms that are past their best
- Whether fresh mushrooms can be frozen
- How to store cooked mushrooms safely
Grow and harvest fresh gourmet mushrooms at home →
Quick answer: what is the best way to store fresh mushrooms?
For most fresh mushrooms:
- Do not wash them before storage.
- Remove any wet or damaged pieces.
- Place them in a clean paper bag.
- Fold the top loosely rather than sealing it tightly.
- Store the bag in the fridge.
- Use the mushrooms while they still feel firm and fresh.
Commercial mushrooms can remain in their original packaging until it is opened. Once opened, transferring them to a porous paper bag can help prevent moisture from being trapped around them. University extension guidance suggests that refrigerated mushrooms may keep for several days and, in suitable condition, up to approximately one week.
The most important rule is to avoid trapping wet mushrooms inside sealed plastic.
Why do fresh mushrooms become slimy?
Mushrooms naturally contain a high proportion of water.
Even after harvesting, they continue releasing moisture.
When mushrooms are placed inside a sealed plastic bag or airtight container, that moisture can collect as condensation.
The mushrooms are then left sitting in a warm, damp microclimate whenever the fridge door opens or the temperature changes.
This can lead to:
- Wet surfaces
- Soft caps
- Dark patches
- Collapsing texture
- Slime
- Faster deterioration
A paper bag is porous.
It helps absorb some surface moisture while still allowing a small amount of airflow around the mushrooms. Extension guidance specifically recommends porous paper bags after commercial packaging has been opened.
How to store fresh mushrooms step by step
Step 1: Check the mushrooms
Before storing them, inspect the harvest.
Remove:
- Loose substrate
- Damaged pieces
- Mushrooms that are already very wet
- Heavily bruised sections
- Old or deteriorating mushrooms
One wet or damaged mushroom can release moisture into the rest of the bag.
Do not store healthy mushrooms together with mushrooms that are already slimy or breaking down.
Step 2: Keep the mushrooms dry
Do not rinse the mushrooms before placing them in the fridge.
Water left between tightly layered caps can accelerate deterioration.
Most cultivated mushrooms only require light cleaning.
Use:
- A soft brush
- Dry kitchen paper
- A clean cloth
- A small knife to trim attached substrate
Wash or briefly rinse them immediately before cooking when necessary.
After rinsing, pat them dry rather than leaving them to soak.
Step 3: Choose breathable packaging
Place the mushrooms inside a clean paper bag.
Suitable options include:
- A brown paper food bag
- A small paper grocery bag
- The paper bag supplied by a greengrocer
- A breathable cardboard punnet covered loosely with paper
Fold the top over lightly.
Do not roll or tape it completely closed.
The bag should protect the mushrooms while still allowing moisture to escape.
Step 4: Refrigerate promptly
Place freshly harvested mushrooms in the fridge as soon as practical.
The Food Standards Agency advises proper chilling because lower temperatures slow the growth of harmful bacteria. UK household fridges should generally be maintained between approximately 0 and 5°C.
Do not leave a freshly harvested crop sitting on a warm kitchen worktop for the rest of the day.
Step 5: Check them each day
Open the bag and inspect the mushrooms.
Look for:
- Condensation
- Damp kitchen paper
- Softening
- Darkening
- Unpleasant smells
- Slime
Replace wet paper and remove any deteriorating pieces.
Use the most delicate mushrooms first.
Paper bag or plastic bag: which is better?
Paper bag
A paper bag is generally the best simple option.
It:
- Allows some airflow
- Absorbs surface moisture
- Reduces condensation
- Protects the mushrooms
- Fits easily inside the fridge
Once opened, commercially packaged mushrooms can also be transferred into porous paper packaging.
Sealed plastic bag
A sealed plastic bag is usually a poor choice for fresh mushrooms.
It can:
- Trap moisture
- Collect condensation
- Restrict airflow
- Encourage softening
- Make mushrooms slimy more quickly
Plastic can still be useful for freezing prepared mushrooms, but it is not usually the best packaging for fresh refrigerated mushrooms.
Perforated plastic packaging
Some commercially sold mushrooms arrive in packaging designed with ventilation holes.
This may be suitable until the package is opened.
Check regularly for condensation.
Once the packaging becomes damp, transfer the mushrooms to paper.
Can mushrooms be stored in an airtight container?
An airtight container can trap moisture in the same way as sealed plastic.
A container may work as an alternative when it is:
- Lined with dry kitchen paper
- Not overfilled
- Opened regularly
- Kept free from standing moisture
- Covered loosely rather than sealed completely
Replace the kitchen paper whenever it becomes damp.
For simplicity, a paper bag is usually easier.
Where should mushrooms be placed in the fridge?
Store mushrooms in a clean part of the fridge where they will not be crushed.
A suitable location may be:
- A vegetable drawer
- A middle shelf
- A shallow section where nothing heavy will be placed on top
Avoid:
- The warm fridge door
- Areas where water regularly collects
- Direct contact with raw meat or fish
- Overpacking the mushrooms beneath heavier food
Keep the fridge between approximately 0 and 5°C and avoid leaving the door open unnecessarily.
Should you use the vegetable drawer?
The vegetable drawer can be suitable because it protects delicate mushrooms from being crushed.
However, some drawers retain a lot of humidity.
Check whether condensation is collecting inside the paper bag.
When the drawer is consistently damp, a middle shelf may keep the mushrooms drier.
The packaging and condition of the mushrooms matter more than the name of the fridge compartment.
How long do fresh mushrooms last in the fridge?
There is no single shelf life that applies to every mushroom.
Freshness depends on:
- Mushroom species
- How mature the mushroom was at harvest
- Its condition when refrigerated
- How gently it was handled
- Whether it was washed
- Packaging
- Fridge temperature
- Moisture levels
As a broad guide, plan to use fresh mushrooms within a few days.
Some mushrooms stored correctly may retain good quality for up to approximately one week, but delicate varieties can deteriorate sooner. Penn State recommends refrigerated paper-bag storage for up to around three days, while Utah State University notes that some mushrooms can keep for up to a week under suitable refrigeration.
These ranges describe quality, not a guaranteed food-safety deadline.
Check the mushrooms themselves and follow any use-by date on commercially packaged produce.
A practical order for using gourmet mushrooms
The following is a practical kitchen guide, not a fixed safety schedule.
Use first
These mushrooms are often more delicate:
- Pink Oyster
- Golden Oyster
- Very mature Oyster mushroom clusters
- Lion’s Mane with long, delicate teeth
Use next
These generally have a little more structure:
- Blue Oyster
- Grey Oyster
- Princess Pearl Oyster
- Phoenix Oyster
- White Elm Oyster
Often firmer
These may retain their structure slightly better when harvested in good condition:
- Shiitake
- King Oyster
- Black Pearl King Oyster
- Speckled Chestnut
Always prioritise the actual condition of the mushrooms.
A damaged or overmature Shiitake should be used before a perfectly fresh Pink Oyster.
How to store home-grown mushrooms after harvesting
Home-grown mushrooms have one major advantage:
You can refrigerate them immediately after harvest.
They have not spent days being packed, transported and displayed.
After harvesting
- Remove the cluster cleanly from the grow block.
- Trim away attached substrate.
- Separate damaged mushrooms.
- Allow any surface mist to dry.
- Place the mushrooms in a paper bag.
- Write the harvest date on the bag.
- Refrigerate promptly.
Do not place warm, wet or freshly misted mushrooms directly into sealed packaging.
For advice on choosing the right harvest stage, read our guide to what to expect from your first mushroom flush.
Should you separate a mushroom cluster before storing it?
Large clusters can be stored whole when they are clean, dry and fit comfortably inside the bag.
Separating the cluster may help when:
- The centre is holding moisture
- The cluster is too large for the bag
- Some mushrooms are damaged
- You plan to cook only part of the harvest
- The base has attached substrate
Avoid breaking mushrooms into very small pieces unnecessarily.
More cut surfaces can increase moisture loss and reduce texture.
Should you remove the stems before storage?
Most cultivated gourmet mushroom stems can remain attached during storage.
Trim only:
- Substrate-covered bases
- Very tough sections
- Damaged tissue
- Dirty material
Shiitake stems can be firm, but they may still be saved for stocks and broths.
King Oyster and Black Pearl stems are substantial and are one of the main edible parts of the mushroom.
How to store different mushroom species
Oyster mushrooms
Oyster mushrooms have layered caps and can trap moisture inside a dense cluster.
Store them:
- Unwashed
- Loosely packed
- In a paper bag
- Away from heavy food
- In the fridge
Check the centre of the cluster for dampness.
Delicate Pink and Golden Oyster varieties are best used promptly.
For cooking ideas, read our guide to cooking Oyster mushrooms three easy ways.
Lion’s Mane mushrooms
Lion’s Mane has a soft, absorbent structure with many fine teeth.
Avoid washing it before storage because water can become trapped within the fruiting body.
Store Lion’s Mane:
- Whole when practical
- Dry
- In a paper bag
- Without pressing heavy food against it
Handle it gently because the mushroom bruises easily.
Cook it while the texture remains firm and the mushroom is mostly white or cream.
Read our guide to cooking Lion’s Mane mushrooms three ways.
Shiitake mushrooms
Store Shiitake mushrooms in a paper bag in the fridge.
Avoid packing too many together.
The caps should remain firm, while the gills should not feel excessively wet.
The stems can become tough but are useful for flavouring stock.
Read our guide to cooking Shiitake mushrooms four easy ways.
King Oyster and Black Pearl King Oyster
These mushrooms have thick stems and relatively firm fruiting bodies.
Store them:
- Whole
- Dry
- In a paper bag
- Without slicing until needed
Sliced mushrooms expose more surface area and may lose quality faster.
Cut them immediately before cooking.
Speckled Chestnut mushrooms
Speckled Chestnut mushrooms have firmer caps and edible stems.
Keep the cluster dry and trim away any substrate from the base.
Place them loosely in paper packaging and avoid crushing the caps.
Should you wash mushrooms before storing them?
It is usually better to wait until you are ready to cook.
Washing mushrooms before storage can leave moisture:
- Between caps
- Inside gills
- Around stems
- Within Lion’s Mane teeth
- At the base of clustered Oysters
That trapped water can accelerate softening.
Clean dry debris with a brush or kitchen paper before storage.
Rinse only when necessary, then dry thoroughly and cook promptly.
Do mushrooms absorb water?
Mushrooms can hold water on and within their surfaces, particularly around gills and tightly packed structures.
A quick rinse immediately before cooking is very different from soaking mushrooms or storing them while wet.
Avoid leaving mushrooms submerged in a bowl of water.
Excess moisture also makes it harder to achieve a browned, crisp texture during cooking.
How can you tell when mushrooms are past their best?
Discard mushrooms when they have clear signs of deterioration, particularly when several warning signs appear together.
Look for:
- A slimy surface
- A strong sour, rotten or unpleasant smell
- Widespread softness
- Mushrooms collapsing into wet material
- Extensive discolouration
- Visible mould
- Leaking liquid
- Significant decay
Do not taste a mushroom to decide whether it is safe.
Commercially packaged mushrooms should also be assessed using the date and storage instructions on the label. The Food Standards Agency distinguishes between quality-based best-before dates and safety-based use-by dates, so labelled use-by instructions should be followed.
When the mushrooms appear spoiled or you are uncertain about their safety, discard them.
Are wrinkled mushrooms still usable?
Light wrinkling can indicate moisture loss and declining quality.
A mushroom that is slightly dry but still:
- Firm
- Free from slime
- Free from mould
- Normal in smell
may still be suitable for cooking soon.
Use it in:
- Soups
- Sauces
- Stir-fries
- Stocks
- Risotto
Wrinkling should not be confused with severe deterioration.
Are dark spots normal?
Small bruises or colour changes can occur through:
- Handling
- Age
- Pressure
- Natural maturation
One small mark does not necessarily mean the whole mushroom is spoiled.
Discard it when darkening is accompanied by:
- Slime
- Wet collapse
- Mould
- Strong odours
- Widespread softening
Can you freeze fresh mushrooms?
Yes, but mushrooms generally retain better quality when they are cooked or briefly heat-treated before freezing.
Freezing raw mushrooms can lead to a softer, wetter texture after defrosting.
The National Center for Home Food Preservation recommends steaming mushrooms or cooking small quantities in a frying pan before cooling, packing and freezing.
Simple frying method
- Clean and slice the mushrooms.
- Cook them in a frying pan until almost done.
- Allow them to cool quickly.
- Divide them into usable portions.
- Place them in freezer-safe containers or bags.
- Remove excess air.
- Label and freeze.
Frozen cooked mushrooms work well in:
- Soups
- Sauces
- Curries
- Pasta
- Risotto
- Stews
Their texture may be softer after freezing, so they may be less suitable as a standalone pan-fried side dish.
Can you freeze mushrooms without cooking them?
They can physically be frozen raw, but texture and quality are likely to suffer.
For better results, steam, blanch or sauté them first.
Freezing slows microbial and chemical changes but does not sterilise food.
Should mushrooms be defrosted before cooking?
Frozen cooked mushrooms can often be added directly to:
- Soup
- Sauce
- Stew
- Curry
- Pasta sauce
When defrosting separately, thaw them in the fridge rather than on a warm worktop.
The Food Standards Agency advises safe chilled defrosting because improper thawing can allow harmful bacteria to grow.
How to store cooked mushrooms
Cooked mushrooms should be treated like other cooked leftovers.
- Allow them to cool promptly.
- Transfer them into a clean covered container.
- Refrigerate them within approximately one to two hours.
- Use them within two days.
- Reheat them only once.
- Heat them until piping hot throughout.
UK food-safety guidance generally recommends cooling cooked food promptly, refrigerating it and eating refrigerated leftovers within two days.
Do not place cooked mushrooms back into the same unwashed container that held raw ingredients.
Can cooked mushrooms be reheated?
Yes.
Cooked mushrooms can be reheated using:
- A frying pan
- An oven
- An air fryer
- A microwave
Reheat them until piping hot throughout.
Only reheat the portion you intend to eat.
Do not repeatedly cool and reheat the same mushrooms.
Common mushroom-storage mistakes
Storing mushrooms in sealed plastic
This traps moisture and encourages slime.
Use breathable paper instead.
Washing before refrigeration
Water can become trapped around the mushrooms.
Clean them immediately before cooking.
Storing mushrooms while still wet from misting
Allow the surface to dry after harvest.
Packing the bag too tightly
Crowded mushrooms can bruise and hold moisture.
Use a larger bag when necessary.
Leaving substrate attached
Substrate can retain water and dirty the other mushrooms.
Trim the base before storage.
Keeping mushrooms in the fridge door
The door experiences frequent temperature changes.
Use a shelf or suitable vegetable drawer.
Forgetting the harvest date
Write the date on the paper bag.
This makes it easier to use older mushrooms first.
Leaving one deteriorating mushroom in the bag
Remove damaged or slimy mushrooms immediately.
Slicing before storage
Whole mushrooms generally retain their structure better.
Slice immediately before cooking.
Frequently asked questions
What is the best container for fresh mushrooms?
A clean paper bag is one of the simplest and most effective options.
It absorbs surface moisture while allowing some airflow.
How long do mushrooms last in the fridge?
For best quality, aim to use them within a few days.
Some correctly stored mushrooms may remain suitable for up to approximately one week, depending on the species and their condition at harvest.
Should mushrooms be stored in plastic?
Avoid tightly sealed plastic.
It can trap moisture and encourage sliminess.
Should fresh mushrooms be washed?
Wait until you are ready to cook.
Brush away loose debris and rinse briefly only when necessary.
Can mushrooms be stored at room temperature?
Fresh mushrooms should be refrigerated rather than stored for extended periods at room temperature.
Proper chilling slows bacterial growth.
Where should mushrooms be kept in the fridge?
Use a clean shelf or vegetable drawer where the mushrooms will not be crushed or exposed to dripping food.
Can you store mushrooms in a glass container?
Yes, provided the container is lined with dry kitchen paper and is not sealed in a way that traps condensation.
Check it daily.
Why have my mushrooms become slimy?
Common causes include:
- Sealed plastic packaging
- Washing before storage
- High condensation
- Storing them while wet
- Keeping them for too long
Can slimy mushrooms be cooked?
Do not try to rescue mushrooms that are slimy, unpleasant-smelling or clearly deteriorating.
Discard them.
Can you freeze mushrooms?
Yes.
Steam or sauté them before freezing for better quality.
How should Lion’s Mane be stored?
Keep it dry, whole and refrigerated inside a paper bag.
Avoid crushing its delicate teeth.
How should Oyster mushrooms be stored?
Keep the cluster dry and loosely packed inside a paper bag.
Check between the caps for trapped moisture.
How should Shiitake mushrooms be stored?
Keep them whole and dry inside breathable paper packaging in the fridge.
Can home-grown mushrooms be stored immediately after harvest?
Yes.
Trim away substrate, allow surface moisture to dry and refrigerate them promptly.
Can cooked mushrooms be stored?
Yes.
Cool and refrigerate them promptly, then use them within two days and reheat only once.
Keep mushrooms cool, dry and able to breathe
The best mushroom-storage method does not require specialist equipment.
Remember these basic rules:
- Refrigerate mushrooms promptly
- Keep the fridge between approximately 0 and 5°C
- Use a paper bag
- Avoid sealed plastic
- Do not wash before storage
- Keep the mushrooms dry
- Check them daily
- Use delicate mushrooms first
- Freeze cooked mushrooms when you cannot use them in time
- Discard mushrooms showing clear signs of spoilage
Harvesting mushrooms at home means you can move them directly from the grow block to the fridge or frying pan.
That gives you the opportunity to enjoy them when their flavour and texture are at their best.
Explore our complete gourmet mushroom grow kits →
Written by The Mushroom Lab
We develop gourmet mushroom cultures and complete home-growing kits in Northern Ireland, with practical guidance covering every stage from inoculation and colonisation to harvest, storage and cooking.
