When is the Harvest Moon? The full Moon that occurs closest to the autumnal equinox is commonly referred to as the "Harvest Moon," since its bright presence in the night sky allows farmers to work longer into the fall night, reaping the rewards of their spring and summer labors. Because the equinox always falls in late September, it is generally a full Moon in September which is given this name, although in some years the full Moon of early October earns the "harvest" designation.
In fact, each full Moon of the year has its own name, most of which are associated with the weather or agriculture. The most common names used in North America include: