Peach nectar is the liquid extracted from the peach after removing the pulp, to which only water and sugar are added to improve the flavor and texture. Peach nectar should be refrigerated after opening and eaten within 7-10 days. If you freeze peach nectar, it can keep for up to 12 months, although it will be at its finest if consumed within 2-3 months. How can you tell whether peach nectar is spoiled? It's simple to tell whether your peach nectar has gone bad.