Mushrooms will last 4 to 7 days in the refrigerator depending on their quality during purchase. All mushrooms absorb water so do not dip mushrooms for a longer period. A refrigerator can be an ideal place for mushroom storage to retain its freshness and quality. If you buy a mushroom and find dirt on it, clean it with a dry pastry brush or paper towel rather than dip it in water. If you want to cook mushrooms instantly then clean them with water or else avoid mushrooms with water.
Since mushrooms have a high amount of water content, it is easy to freeze them but they tend to change their structure following the ice crystals form.