The shelf life of chopped shallots is determined by how they are stored.  However, the easiest approach to keep chopped shallots fresh is to keep them refrigerated. When stored properly, fresh shallots can last up to ten days. If you dry the shallot slices before storing them in an airtight jar in the refrigerator, their shelf life can be extended to 9 months. Shallot slices can be dehydrated or frozen to extend their freshness even further.