WALNUTS, COMMERCIALLY BAGGED OR PURCHASED IN BULK — OUT OF THE SHELL
The precise answer to the question “How long do walnuts last once shelled?” depends to a large extent on storage conditions —because of their high oil content, walnuts must be stored properly to avoid becoming rancid.
To maximize the shelf life of shelled walnuts, store in cool, dry area; after opening the package, place the walnuts in a sealed airtight container or place original package in a resealable heavy-duty freezer bag.
To further extend the shelf life of shelled walnuts, the walnuts may be stored in the fridge or freezer; place walnuts in a sealed airtight container or place original package in a resealable heavy-duty freezer bag.
Shelled walnuts can be thawed and refrozen repeatedly during the freezer time shown without any significant loss of flavor or texture.
How long do shelled walnuts last when stored in the freezer? The freezer time shown is for best quality only — foods kept constantly frozen at 0° F will keep safe indefinitely.
How to tell if shelled walnuts are bad? Rancid walnuts will often develop a bitter, unpleasant taste; if walnuts develop an off odor or taste, or if mold appears, they should be discarded.
Sources: For details about data sources used for food storage information, please