Recommendations vary, but most sources say walnuts will last up to 3 months in the pantry, 1 year in the refrigerator, and 3 years in the freezer. However, shelf life varies depending on temperature, type of nut, and whether it is peeled, roasted, or whole pieces. When walnuts go rancid, they can release carcinogens that are harmful to long-term health. In addition, it may cause some damage or pain to the digestive tract.
So, if your long-term storage nuts taste a little weird, simply discard them. To preserve the quality of nuts, keep them away from onions and other high-odor foods. They tend to absorb the smell of things around them. Store shelled walnuts at room temperature for up to three months.
Store shelled or shelled walnuts in the refrigerator for up to six months, or in the freezer for a year or longer. Label your nut packages with the date they were stored so you know which ones to use first. Avoid long-term storage of nuts in food for more than two years. Nuts are high in lipids (fats), which causes them to go rancid due to enzymatic reactions in 3 to 24 months, depending on the variety of nuts.
Oxygen-free storage does not improve shelf life. This keeps the air out, which means fresher nuts, and prevents outside odors from entering, which are easily absorbed by nuts and seeds. Still, you should put the nuts in an airtight container or in a vacuum-sealed bag beforehand to protect them from oxygen and moisture. Foods repackaged and stored in oxygen-free storage typically have less than 10% moisture and are low in fat.
Assuming walnuts are stored in suitable containers and environments, shelled walnuts or in-shell walnuts can be stored at room temperature for up to three (months). If you plan to use them in the immediate future, it's OK to store airtight containers in a cool, dark place in your pantry. You may be able to recover them from the dead by throwing them in the oven on a baking sheet, but this is a short-term solution. This isn't a complete list, but it will help you get started if you're interested in starting a nut forest.
Peanuts last 6 to 9 months in the pantry 1 year in the fridge 2 years in the freezer. Walnuts, pistachios, hazelnuts, almonds and the batch are tasty treats in the nut mix, but their uses are almost endless. While it's tempting to buy walnuts, cashews, and peanuts on the same shopping trip, if you don't desperately need all three, choose only what you're going to use before your next shopping trip. It can be stored in a cool place for a while, even without refrigeration, especially for those of you who have good, cool basements.
Brazil nuts last 9 months in the pantry, 1 year in the fridge and 1 year in the freezer. In 1 paragraph you say that it should come as no surprise that shelled walnuts last longer than shelled walnuts. Either way, it's important to store nuts in an airtight container so that they maintain the proper moisture level.