If you have any leftover sweet potato fries, you can store them in the refrigerator in an airtight container or zip lock bag for 3-5 days. When you are ready to reheat, place on a baking sheet and warm up the fries in a 425 degree oven for 10 minutes or until crispy! Or, you can pop these in an air fryer or toaster oven to make sure they stay crispy!