QUESTION: How long does finished compost last?
ANSWER: Finished compost lasts well over one year, but it is best to use it within one year because it starts to lose volume and nutrients after a year has passed. Microbiological activity will also begin to diminish significantly after the first year. Technically, as long as compost is stored properly, it will not go bad or expire, but it is recommended that you use all your compost within one year before it starts to deteriorate.