The precise answer to the question “How long do mashed potatoes last?” depends to a large extent on storage conditions — refrigerate all cooked potatoes (including mashed, baked, boiled, scalloped) within two hours of cooking.
To maximize the shelf life of leftover mashed potatoes and other cooked potatoes, refrigerate in covered airtight containers or wrap tightly with heavy-duty aluminum foil or plastic wrap.
To further extend the shelf life of mashed potatoes, freeze them; freeze in covered airtight containers or heavy-duty freezer bags.
How long do mashed potatoes last in the freezer for safety purposes? The freezer time shown is for best quality only — foods kept constantly frozen at 0° F will keep safe indefinitely.
Whole baked or boiled potatoes will be watery when thawed, and freezing is not recommended.
How long do mashed potatoes and other cooked potatoes last at room temperature? Bacteria grow rapidly at temperatures between 40 °F and 140 °F; cooked potatoes should be discarded if left for more than 2 hours at room temperature.
How to tell if mashed potatoes or other cooked potatoes are bad? The best way is to smell and look at the potatoes; discard any cooked potatoes with an off smell or appearance, do not taste the potatoes first.
Sources: For details about data sources used for food storage information, please