Yes, you can freeze baked donuts for later. For unfrosted donuts, line an airtight container with parchment paper. Arrange the donuts inside, using squares of parchment paper between the treats for stacking. Freeze up to 1 month. For frosted donuts, arrange them on a lined baking sheet and freeze for 2 hours, or until the frosting has hardened. Transfer the donuts to a lined airtight container and freeze.