When stored at 0 degrees in the freezer, either shelled meats or inshell pecans will maintain quality for two years. Under refrigeration, pecans should maintain their quality for several months. Storing pecans at room temperature is not recommended. Shelled pecans do not have to be thawed before use in recipes. However, if you are grinding the nuts in a blender or processing in a food processor to produce pecan meal, the meats should be allowed to dry at room temperature when taken out of a freezer or refrigerator.