Store fresh mushrooms in a paper bag or breathable container on a shelf (not the crisper drawer), where they'll keep for 7–10 days. Mushrooms release moisture, so paper absorbs it better than plastic, which traps humidity and speeds decay. Keep them away from direct contact with other produce, and never wash them until you’re ready to cook.
Why the container and location matter more than you’d think
Most people store mushrooms in plastic bags or containers, which is where things go wrong. Mushrooms are mostly water, and as they age, they release moisture. Plastic traps that moisture against the mushroom surface, creating a humid microclimate that accelerates bacterial growth and causes spotting and slime within days. A paper bag, by contrast, breathes. It absorbs excess moisture while allowing air to circulate, slowing the breakdown process significantly.
The fridge shelf is also critical. The crisper drawer, designed to lock in humidity for leafy greens and vegetables, is the worst place for mushrooms. Place them on a middle or upper shelf where the air is drier and the temperature more stable. This simple change alone extends storage life by several days. I’ve seen this difference repeatedly when working with restaurants and markets across South London—the growers and chefs who get storage right waste far less of their stock.
What to do before you store mushrooms
Do not wash mushrooms before storage. Water is the enemy of shelf life; it accelerates the decay process and adds the very moisture you’re trying to keep away. Instead, if your mushrooms are visibly soiled, use a soft, dry cloth or a clean, damp brush to remove soil gently just before you cook them. This preserves the protective layer on the mushroom cap and keeps storage life intact.
When you bring fresh mushrooms home from a market or grower, remove them from any plastic packaging immediately. If they came in a container with condensation, transfer them to a paper bag or a breathable produce container. This takes thirty seconds and can add days to their life. I always advise the people I meet at the West Norwood Feast and in our workshops to do this as their first step at home.
How long different mushroom types stay fresh
Storage duration depends on the mushroom variety. Button mushrooms and portabellos, which have firmer, less delicate flesh, typically last 7–10 days in a paper bag. Oyster mushrooms, which we grow regularly at the studio, are slightly more delicate and are best used within 5–7 days, though they still keep well if stored correctly. Shiitake mushrooms, with their tough caps, often last up to 10 days. The key is that freshness matters for flavour; even if a mushroom looks acceptable after two weeks, its depth and texture will have diminished.
Specialty and foraged varieties, such as those we forage and work with in collaboration with the South London Mushroom Club, are more fragile and should be used within 3–5 days. These mushrooms have thinner flesh and higher water content. If you’re buying from a grower or forager, ask about the variety and its expected lifespan—it’s information they should know well and be happy to share.
When to extend storage: drying and other options
If you know you won’t use fresh mushrooms within the storage window, drying is a reliable alternative that concentrates flavour. Slice them thinly and lay them on a clean cloth or rack in a warm, dry place away from direct sunlight, or use a low oven (around 50–60°C) with the door slightly ajar. Dried mushrooms keep for months in an airtight container. At the studio, we produce dried mushroom products and seasonings because drying is not just practical storage—it transforms the mushrooms, intensifying umami and opening different culinary possibilities.
Freezing is another option, though it changes texture; mushrooms become softer when thawed because ice crystals damage cell walls. Freeze them whole or sliced on a tray first, then transfer to a freezer bag to prevent clumping. Use frozen mushrooms in cooked dishes—soups, stews, sauces—where texture is less critical. Fresh storage in the fridge is always preferable if you’re planning to eat them within a week, because it preserves the structure and bite that makes gourmet mushrooms worth seeking out.
Signs your mushrooms have gone off
A mushroom that’s past its best shows clear signs. Sliminess on the surface is the most obvious one—this is bacterial growth and means the mushroom should be discarded. Darkening, spotting, or wrinkled skin also indicates age and declining quality. A strong, sour, or unpleasant smell is a definite sign of spoilage. Any visible mould (other than the natural bloom on some varieties like shiitake) means discard the whole batch, because mould spreads quickly in the moist environment of a storage container.
A mushroom that’s slightly darker or drier than when you bought it isn’t necessarily off—some darkening is natural oxidation—but it’s a signal to use it soon. If it’s still firm, smells earthy and clean, and has no slime or mould, it’s safe to cook. Trust your senses. I encourage people in our cultivation workshops and community events at the Remakery in Brixton to handle mushrooms regularly so they develop intuition about freshness.
Storage as part of the wider mushroom experience
Proper storage isn’t just about reducing waste—it’s about respect for the mushroom and the grower’s work. When you buy from a local cultivator or forager, they’ve invested time, care, and skill to bring that mushroom to you at peak ripeness. Storing it well means you actually taste what they’ve grown, rather than eating a degraded remnant a week later. This matters whether you’re cooking at home, running a restaurant, or teaching others about mushrooms.
At the studio, we prioritise transparency about our growing methods and sourcing because we want people to understand the journey their food has taken. Storage is part of that story. When you get mushrooms home, you’re the final steward. A paper bag and a shelf in the fridge are small gestures that complete the process, protect flavour, and reduce waste. If you’re curious about growing mushrooms yourself or want to learn more about storage and preparation, our workshops and get in touch page are always open.