Wax melts if stored correctly can be good for years. We typically suggest using your melts within a year of purchase. Wax Melts should be stored in a cool, dry, and dark place. Usually an air tight container works best. Bagging your clamshell in an air tight bag will also help for prolonged storage. Polypropylene or Cello bags are recommended as they will not hinder your fragrance throw over time like a ziplock bag or any other general storage bag will.