Pecans and Storage Pecans are perishable because of their high oil content and they must be stored properly to maintain good quality. To keep your pecans fresh all year: At home, unshelled pecans can be stored in a cool, dry place for three to six months. Shelled pecans need to be either refrigerated in airtight containers for up to nine months, or frozen in zipper locked freezer bags for up to two years. Pecans can be frozen and .