Storage pistachio Storage pistachio : If you want to store a large quantity of nuts, it's best to put them in heavy-duty freezer bags and freeze them. Frozen, they will keep for several months. For shorter storage you can refrigerate pistachios for up to 4 to 6 weeks. If pistachios stored over a long period lose their natural crispness, you can quickly revitalize them. Just place them on a baking sheet...