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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.
Rating Newest Oldest. Best Answer: Generally, you do not want to keep mushrooms for longer than a week. However, the general method of checking that your mushrooms are still fresh is to feel them. If they feel slimy or look darker than normal, it is time to throw them away.eport Abuse. about week, mushrooms must be stored in a brown paper bag in the crisper of you fridge..because mushrooms are 90% water they sweat inside a plastic bag and become watery..