When stored properly, dry cat food can sometimes last up to 6 months. The best way to provide protection from the environment or insects is by keeping your cat’s food in a container with a tightly sealed lid. Whenever you open or close the pet food storage container, make sure the lid is completely sealed. By doing this, you can save money and keep your kitty from eating stale food. Be sure to look at any expiration dates on your cat food’s packaging and label your container appropriately.