Mashed potatoes can last in the refrigerator for 3 to 5 days if stored properly. To maintain their freshness and safety:
- Storage: Place the mashed potatoes in an airtight container or tightly cover the dish with plastic wrap or aluminum foil.
- Temperature: Keep the fridge at or below 4°C (40°F).
- Check Before Eating: Discard if they develop an off smell, a sour taste, or visible mold.
For longer storage, mashed potatoes can be frozen for up to 2 months, although the texture may change slightly upon reheating. Reheat them thoroughly to a safe temperature of at least 74°C (165°F).