Unlike cat food, medicine, and supplements, PrettyLitter does not have a shelf life or an expiration date. As long as you keep the cat litter dry and protect it from moisture, you can store it for extended periods if it remains unused or unopened. To help avoid the potential of expired cat litter and to maintain maximum freshness, we recommend that pet owners store the cat litter in a cool, dry place, avoiding areas with high moisture levels such as bathrooms and laundry rooms.