According to Chestnuts for Sale:

Chestnut storage is not the same as most nuts. Fresh chestnuts should be stored like carrots. Chestnuts are comprised of about 40-50% water and thus if not stored properly, they will spoil. Therefore, chestnuts should be stored with great care and attention. The ideal storage conditions for chestnuts are 33-35 degrees Fahrenheit and 85-90% humidity. We recommend storing chestnuts in covered containers in the coldest part of the refrigerator. Stored properly in the refrigerator, chestnuts can have a shelf life of approximately 2-3 weeks. If you plan to use the chestnuts soon after receiving them, simply place them in a covered container in the coldest part of the refrigerator. The colder, the better.

Otherwise, they recommend freezing them (preferably par-cooked), and provide information at the link above.

Washington Chestnut offers the following information about storing chestnuts, to prevent molding to which they indicate the chestnuts are susceptible due to their high water content:

1. Do not let fresch chestnuts freeze and thaw (except if you are freezing for a purpose)
2. Never store chestnuts in a sealed plastic bag (except dried or frozen)
3. Keep chestnuts refrigerated unless drying or sweetening the chestnuts
4. If black molds have entered into the chestnut kernel, do not eat the chestnut
5. Chestnuts can be stored in the refrigerator for 2 to 3 weeks
6. Cooked chestnuts must also be refrigerated if not consumed right away
7. Never bathe the chestnuts in plain water - this causes mold spores to be transferred to all the chestnuts passing though the bath water - instead, wash in clean running tap water
8. Try to purchase fresh chestnuts close to the time you want to eat them

我飼養和出售新鮮的栗子。長期保存的秘訣是在收穫後的前24小時內適當處理栗子，然後再開始變質。在這24小時內，我們對堅果進行了清潔，定級，分級，並置於濕度[85-90％]的冷藏[32華氏度]下。由於季節性需求，我們通常在12月15日左右將未售出的新鮮堅果放在乾燥室中，以便明年與乾燥產品一起使用。在那個截止日期，堅果還是可以的。始終嘗試直接從美國生產商那裡購買農場。去年，我們每天晚上吃新鮮堅果儲存在我們的蔬菜保鮮盒中，直到4月1日我們的個人緩存用完為止。我將給適當存放的堅果保質期超過2-3週。

Chestnuts spoil in two ways: they go moldy and they dry out and become pretty much impossible to eat when roasted. It's possible that when they are hard and dried out, they could be ground into flour or something; I've never tried that.

Being light is a really good indication that they've dried out. Some chestnuts are moldy when I buy them, and I am pretty sure the ones I bought before Xmas that are still on my counter are either moldy or hard right now. The good news is you can't miss the mold when you take the shells off the cooked chestnuts and you often spot it when you cut the X before you cook them. Don't eat moldy ones. The hardness won't hurt you, so give them a quick bake and see if you actually have any nice ones still (you probably don't.) But don't save them for Valentines!

我發現它們也傾向於很快變乾而不是腐爛。它們將變得越來越硬，更輕，並且外殼變得更脆，並且在外殼和螺母之間出現明顯的間隙，從而使凹處回彈。幹dry時，幹riv的螺母會皺縮，從而導致皺紋。當切開要燒的貝殼中的十字架時，通常會立即顯而易見。

當它們像這樣時，它們烤得非常乾又乾，而且經常很難去除貝殼-並不是很好圓形，但如果今天要吃栗子粉，則可以將它們磨碎。在味道變酸之前需要花費一些時間。簡而言之，如果要整體使用或切碎使用它們，請嘗試使用感覺較堅固的較重的容器，並且不要將它們放置太久。我發現商店中最好的約會日期通常是在購買後一周左右的時間內，對於他們何時會過時，這並不是一個不好的估計。

將栗子放在水槽中...浮子是被寵壞的...好的浮子是較重的並且會下沉。

我在2014年11月購買了一些東西，將它們放在辦公室的小冰箱中。它在25至35度之間循環。今天4月9日，我拿出2份去皮，檢查了它們的去皮情況，發現它們沒有發黑的黴菌，也沒有發霉，也沒有變乾變硬，我吃了一個，味道還不錯。似乎溫度在冰點和稍高於冰點之間的旋轉使它們保持新鮮和良好。