The shelf life of nuts will vary depending on the type and storage method. Here are the shelf lives of some common nuts: Almonds: Unopened almonds can be stored at room temperature for 9 to 12 months and should be consumed within 1 to 2 weeks after opening. If placed in the refrigerator, unopened almonds will keep for about a year refrigerated and up to two years frozen1. Cashews: The shelf life of cashews is not as long as that of almonds, and they can remain fresh during the shelf life if unopened. An unopened bag of cashews can still be consumed even 6 to 9 months after the shelf life. Cashews can be stored in the refrigerator for about one year and frozen for about two years1. Pistachios: The shelf life of pistachios is not very long. Generally speaking, they may go bad if they exceed the shelf life by 3 months. Once the package is opened, it needs to be consumed within 1 to 2 weeks. They cannot be stored in the refrigerator or frozen. Pecans: Pecans can be stored at room temperature for 6 months if unopened. Once opened, unless eaten within a week or two, they can be stored in the refrigerator for about a year. If frozen, they can be stored for two years. Year.