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Refrigerating or freezing your leftover mashed potatoes is fine, providing you know how to go about it. You shouldn’t keep mashed potatoes in your fridge for more than four days.
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How to Store Leftover Mashed Potatoes (How to)

Do mashed potatoes go bad? It will last three to five days in the fridge if stored correctly and within two hours of cooking.
Calories:

Materials

  • leftover mashed potatoes

Instructions

Storing Leftover in the Fridge:

  • The first thing to remember is that you should refrigerate mashed potatoes within 2 hours of cooking. 
  • Ensure that your fridge’s temperature setting is at its lowest to help speed the cooling process and prevent any bacterial growth.
  • Spoon the mashed potatoes into shallow containers or Ziploc bags, ensuring the depth doesn’t exceed 3 inches. This promotes quicker cooling.

If the potato is still particularly hot, you can use the sink cooling method as follows:

  • Fill your sink or bowl with a bit of iced water. Transfer the container or Ziploc bag into the water, ensuring that it is only partially submerged.
  • Take a ladle or spoon and gently stir the mashed potato to facilitate faster heat loss. You want to get the mash down to a temperature of under 70°F.
  • Another way of doing this is to use a cooling paddle. If going down this route, it’s best to transfer the mashed potato into a wide bowl.
  • Once the temperature is below 70°F, you can transfer the potato into a shallow container or Ziploc bag and place it in your fridge, still open, until the temperature drops to 40°F.
  • Once it does, you can then put the lid in place or zip the Ziploc bag closed and leave the mash in the fridge until you want to use it.

Storing Mashed Potatoes in the Freezer:

  • It would be best to let the mashed potato cool down before freezing. Refer back to the two methods discussed earlier.
  • Once cooled, divide the potato into portion sizes and transfer it into freezer-safe shallow containers or Ziploc bags.
  • Do not stack the bags, or they will stick together en masse after putting mashed potatoes in Ziploc bags.
  • Flash freeze them and once the contents turned solid, you can stack the packages if you need to save space.

Notes

  • Adding dairy products, including eggs, to your mashed potatoes can affect how long you can store them.
  • Anything you add to the mashed potatoes can affect both the flavor and consistency.