To freeze homemade French fries, line the already-baked fries in a single layer on a cookie or baking sheet. Leave them in the freezer for about an hour or until they are fully frozen. Place the fries into a freezer bag or another airtight container.
Freezing the fries on the baking sheet first keeps them separated, even after you put them in a bag together.
Homemade French fries may turn brown in the freezer. Although the brownness is not harmful, you can sprinkle lemon juice on the fries to help prevent this discoloration. For the best taste, consume the fries within two months of freezing.