Leftover pizza, whether homemade, frozen or carry-out, lasts for three to five days in the refrigerator and up to six months in the freezer when stored properly. Before storing, wrap the leftover pizza tightly in foil or plastic wrap, or transfer it to an airtight, freezer-safe container.
Defrost frozen leftover pizza in the refrigerator before reheating. Leftover pizza can be eaten cold or reheated in the oven at 350 degrees Fahrenheit for 10 minutes. Microwaving pizza tends to make the crust tough and chewy. Adding a few drops of water to the plate helps keep the crust soft and edible.