Back to Search Subject - Preserving walnuts QUESTION - Do you happen to have directions for canning walnuts? ANSWER - The best way to store nuts is to freeze them with minimal exposure to light and oxygen. After the kernels have been removed, place them in a plastic bag and store in the freezer. The nut meats will keep almost indefinitely when stored in the freezer. Kernels can be stored for short periods in the refrigerator. Harvesting, Cracking, and Storing Black Walnuts