Can You Freeze Portobello Mushrooms?
Yes, you can freeze it.
10-12 months (best sautéed first)
Like other mushrooms on this site, raw portobellos don't freeze well given their high water content — sautéing them first drives off much of that moisture, producing a considerably better 10-12 month frozen result than committing raw mushroom to the freezer ever would. In the fridge beforehand, a paper (not plastic) bag matters for the same underlying reason, letting moisture escape rather than trapping it against the mushrooms and accelerating sliminess.
Removing the gills from underneath a portobello cap before freezing, a step some cooks also take before grilling them fresh, reduces some of the dark, watery liquid that gills release during cooking, giving a slightly cleaner result once the frozen, sautéed portobello is reheated later.
A portobello's large, flat cap makes it a popular choice for grilling and serving whole as a meat substitute, a preparation that doesn't translate well to freezing raw — pre-cooking is essential here more than for almost any other mushroom on this site, given how much liquid a whole raw cap this size would release once thawed.
A portobello cap grilled whole and then frozen holds its shape slightly better than one that's been sliced before freezing, since the intact grilled surface has already developed a firmer, slightly seared texture that resists further breakdown a bit better than raw-sautéed slices do.
A portobello cap that still springs back gently when pressed is a good sign it's ready to cook and freeze rather than already past its best.
Storage times and safe temperatures are general guidance from USDA FoodKeeper, USDA FSIS, and FDA sources — they are not a guarantee of safety. When in doubt, throw it out. This is not a substitute for professional food-safety advice.
Source: USDA FoodKeeper data, checked 2026-07-12.
See Portobello Mushrooms's full storage & shelf-life guide →