Michigan State University Extension
Preserving Food Safely - 01600672
Properly dried nuts in the shell will keep for several weeks at room temperature. For longer storage, nuts in the shell must be kept cool and dry to prevent flavor changes due to rancidity of the fat.
Keep nuts in the shell in airtight glass, plastic or metal containers in a cool, dry, dark location, below 70 degrees Fahrenheit. Quality will remain good for about four months under these conditions. As with other dried foods, the lower the storage temperature, the longer the shelf life. For long- term storage, package shelled nuts in moisture vapor-proof containers and store in the refrigerator or freezer. Although nuts in the shell take up more room, they have a much longer shelf life than shelled nuts.