Store chestnuts in covered containers in the coldest part of your refrigerator, or in 30 to 35 degrees Fahrenheit and 85 to 90 percent humidity. When stored properly, their shelf life is roughly two to three weeks.
For optimal long term storage, freeze the chestnuts. Transfer the raw, uncooked chestnuts to plastic freezer bags. You also can vacuum-seal them. Thaw the chestnuts before cooking them according to a particular recipe. Freezing raw, uncooked chestnuts reduces their shelf life, so it is best to use them promptly after thawing them out.
You also can cook the chestnuts, peel them, transfer them to a freezer bag, or vacuum-seal them. Place them in the freezer until you are ready to use them. For another method, partially cook the unpeeled chestnuts at 375 degrees Fahrenheit for 10 to 15 minutes.
Place them into a freezer bag, or vacuum-seal them, and freeze them until you require them. To use them, remove them from the freezer, thaw them, and finish cooking them in the microwave or the oven. Cooking times vary.