How to Dehydrate Mushrooms and Store Them Properly
Drying mushrooms is integral to turning a short-lived harvest into something you can keep for later. Especially if you like to grow A LOT. The part that matters most is easy to miss: a mushroom can feel dry outside while still holding moisture in its thickest parts.
I learned that the hard way after my very first successful grow. I thought the mushrooms were dry, packed them away, and later found they had softened and started to spoil. *sobs* Now I give drying and storage the same attention as the grow itself.
The short answer
Using a dehydrator at 120°F (about 49°C), following the equipment instructions, and drying until the pieces are crisp or brittle after cooling is what we're aiming for. Pack them promptly into clean, dry, tightly sealed containers and store somewhere cool and dark. Oregon State Extension provides the mushroom-specific temperature and dryness guidance.
The timer is a reminder to check. It is not proof that the batch is ready.
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What you need
- A food dehydrator with temperature control and steady airflow.
- A clean knife, cutting board, and fresh mushrooms in good condition.
- Clean, completely dry glass jars with tight-fitting lids, or suitable moisture-resistant food-storage packaging.
- Recommended - desiccant packs labeled for food storage. Follow the packet maker’s sizing and replacement instructions.
I like glass jars because I can see the contents and check for condensation. Use ordinary storage lids that seal properly, rather than the vented lids used for growing grain spawn.
Watch the drying and storage walkthrough
Watch the full tutorial on YouTube.
Temperature note: the demonstration uses my lower 104°F setting. This written guide follows Oregon State Extension’s 120°F guidance for culinary mushrooms, so the longer drying times from my setup are not a schedule for this method.
1. Start fresh and prepare even pieces
Dehydrating is not a way to rescue a slimy or moldy batch. Drying and cooking also do not make poisonous mushrooms safe to eat, so be smart.
Brush away debris, rinse off excess substrate, and drain well. Trim away tough or woody stem ends. Cut large mushrooms into reasonably even pieces, about ½ inch thick or thinner, so the center is exposed rather than hidden inside a thick stem. Small mushrooms may be dried whole, but check their thickest parts carefully.
2. Leave room for air on every tray
Spread the pieces in a single layer with space between them. Avoid piles, overlapping caps, and tightly packed trays. I opt for using more trays rather than trying to squeeze the whole harvest onto one or two.
Cut down anything that is too tall for the tray spacing. If your dehydrator dries unevenly, rotate the trays as its instructions recommend. Small pieces may finish before the largest ones, so check more than one spot.
3. Use steady heat, then judge the mushrooms
120°F is the starting temperature for this food-preservation method. Follow your dehydrator’s operating directions and use its mushroom guidance for loading and checking the batch.
How long does it take to dehydrate mushrooms?
There is no dependable hour count for every harvest. Thickness, the amount on each tray, airflow, and room humidity all change drying time. A small load of sliced mushrooms can finish much sooner than a full machine holding thick, whole pieces.
In my 104°F setup, smaller harvests tend to take about 12 to 24 hours and have even taken up to 48 hours. Those are examples from that lower-temperature setup, not required drying times at 120°F. Check the actual pieces and keep drying any that are still flexible inside.
Once the mushrooms are fully dry, there is no benefit to leaving the machine running indefinitely. Avoid unnecessary extra heat and follow the equipment’s limits.
4. Cool a sample and check for brittleness
Take out several pieces, including a thick stem or the largest piece from each part of the machine, and let them cool before testing. For this method, you want a crisp, brittle texture: a piece should snap instead of folding or feeling rubbery. Missouri’s mushroom-preservation guide uses the same snap-rather-than-bend check.
If a thick piece still flexes, return it and any similar pieces for more drying, then cool and test again. This is a useful home check, not a laboratory measurement of water activity or proof that drying has sterilized the food.
5. Cool completely, seal, and keep moisture out
Let the finished batch cool completely before packing, then get it into storage promptly. University of Minnesota Extension suggests 30 to 60 minutes of cooling and notes that leaving dried food exposed for too long lets it pick up moisture again.
Pack into clean, dry containers with tight lids. Divide a large harvest into smaller batches so you do not open the entire supply each time you want a few pieces. Vacuum packaging is another option for fully dried mushrooms. The National Center for Home Food Preservation explains why cooling, moisture-resistant packaging, and small portions matter.
Do dried mushrooms need a desiccant pack?
A food-storage silica gel packet is optional help with moisture inside the package. It cannot replace complete drying or repair a leaky lid. Choose a product labeled for food storage, leave the packet intact, and do not eat it. Poison Control explains food-grade silica gel and its use as a moisture absorber.
If you use indicator packets, follow that specific product’s color guide. Mine start a bright orange, and turn a darker brown. The color change tells you the packet has taken up moisture; it does not tell you the mushrooms are safe or identify where the moisture came from.
Where should you store the jars?
Choose a cool, dry, dark cupboard away from sunlight, a hot appliance, or steam. Check the jars regularly. Moisture droplets, a loose lid, or mushrooms that have softened are reasons to investigate rather than simply put the jar back on the shelf.
If something seems wrong
| What you notice | What to do |
|---|---|
| Pieces bend after the drying cycle | Keep drying, then cool and test again before storage. |
| Condensation shortly after packing | If the batch is freshly packed and unspoiled, redry promptly, cool fully, and repackage in a dry container. |
| Indicator packet changes color | Check the product instructions, lid, and contents. Do not assume replacing the packet fixes the batch. |
| Mold, an off smell, or an uncertain period stored damp | Discard the affected batch. Redrying is not a way to make spoiled mushrooms safe. |
How long do dried mushrooms last?
Shelf life depends on how completely the mushrooms dried, the packaging, storage temperature, and how often you open the container. Texas A&M Extension uses up to six months for dried vegetables in good storage conditions; that is a practical quality-planning reference for a home pantry, not a mushroom-specific safety guarantee.
I've personally consumed dried mushrooms after over a year and they seemed fine for what it's worth.
Label the drying date, use older batches first, and check that they stay dry. A date on a jar cannot make up for moisture or spoilage.
How to rehydrate dried mushrooms for cooking
Soak only the amount you plan to cook. For a longer soak, use a covered container in the refrigerator rather than leaving mushrooms in water on the counter. University of Missouri Extension recommends refrigerated rehydration and thorough cooking afterward.
You can also add dried edible mushroom pieces to a soup or stew that has enough liquid and cooking time to soften and cook them thoroughly. Treat dried mushroom powder as a cooking ingredient, too. Drying does not make raw mushrooms ready to eat.
Quick answers
Can I use an oven or air fryer instead of a dehydrator?
Only if the appliance can maintain suitable drying conditions with enough airflow, and its instructions support that use. Be careful not to use too much heat. A regular cooking setting is not the same as a dehydration mode. A food dehydrator is the more straightforward option because it is built to move air through the trays.
Do dried mushrooms need to be refrigerated or frozen?
Not necessarily. Correctly dried and packaged food can be kept in a cool, dry cupboard. Cold storage can extend quality, so refrigeration and freezing are not automatically wrong. Minnesota Extension includes colder storage as an option. Use moisture-proof packaging and follow the container’s freezer instructions if you choose cold storage.
Should I grind mushrooms before storing them?
I prefer storing pieces and grinding a small amount when I am ready to consume them. Powder is convenient, but it gives you more exposed surface and makes the batch harder to inspect piece by piece. Keep any powder tightly sealed, dry, and labeled; add it to cooked dishes rather than assuming it is a ready-to-eat supplement.
Keep learning after the harvest
Drying is one part of making a grow worthwhile. If you are planning your next edible mushroom project, my Lion’s Mane growing guide follows a grow from grain spawn through harvest.
Happy Growing!