Cat litter usually doesn’t have an expiration date as it’s a long-lasting product. However, over time it can become less effective. If the litter gets wet or exposed to moisture, it may clump or harden. This makes it less able to absorb liquids and odors. Also, if stored in extreme conditions or for too long, the litter may begin to smell or absorb odors from the environment. It’s best to store cat litter in a cool, dry place and it within a reasonable time frame. If you notice any changes in the litter’s texture, odor, or performance, it’s time to buy a new one.