How Long Can You Keep Compost? You can keep compost indefinitely. However, keep in mind that the longer you store it, the more nutrients it loses. When you store compost, it grows richer in nutrient content for about four months. Otherwise, four to five months in, it starts to lose nutrients. That said, if you have to store your compost for a period longer than four months, all is not lost. As mentioned earlier, it’s possible to rejuvenate old compost. Learn more at: https://gardenguidepost.com/how-to-store-compost/