All spices are shelf-stable and never truly expire. However, the potency of flavor will start to disappear the longer it is stored. Ground spices will lose there freshness after 6 months. If you smell them and there's not much fragrance, it's probably time to buy a new one. I like to do a spice purge every 6 months refreshing my whole spice drawer with new ones. This just makes it easier to keep track of.