You can safely peel potatoes for mashed potatoes up to 24 hours ahead, as long as you store them properly in water in the fridge to prevent browning and texture issues.

How Early You Can Peel

  • Most home-cooking and food sites agree you can peel and cut potatoes the day before you plan to cook them, roughly 12–24 hours in advance.
  • Beyond about 24 hours, the risk of off flavors, discoloration, and a slightly mealy texture goes up, even if they are in water.

How To Store Peeled Potatoes

  • Place peeled, cut potatoes completely submerged in cold water in a bowl or container; exposure to air is what causes browning.
  • Cover the container and refrigerate; cold slows oxidation and bacterial growth so your potatoes stay pale and firm until you’re ready to boil them.

Extra Tips For Great Mashed Potatoes

  • Larger chunks or whole peeled potatoes hold up better to overnight soaking than tiny dice, which can get waterlogged faster.
  • When you’re ready to cook, drain the soaking water, rinse the potatoes, then boil in fresh, well-salted water to keep flavor bright and texture fluffy.

Information gathered from public forums or data available on the internet and portrayed here.