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According to Mountain View Mushrooms, fresh mushrooms can be stored at 34 to 40 degrees F for up to 10 days from the date of packaging. If purchasing store-bought mushrooms, the packaging date will be printed on the storage container or plastic wrap.
Quick Answer. Whole mushrooms stay fresh for about seven to 10 days, while sliced mushrooms should be eaten within five to seven days for the best quality. Once cooked, mushrooms keep for an additional seven to 10 days. Keep Learning.