How long is the shelf life of cat food?

Cat food generally has a shelf life of only 12 to 18 months, but once opened most should be finished within 1 to 2 months. Different foods vary by production process, yet the package always states the date, so just follow it. To avoid spoilage from dampness after opening, small-cat households are advised not to buy large bags, and opened food should be poured promptly into a well-sealed container.