The full moon closest to the September equinox — famous for rising near sunset several nights running, lighting the harvest. The lore and how to see it.
Short answer
The Harvest Moon is the full moon nearest the September equinox — usually September's. Its trick: it rises only a little later each night, so for several evenings a bright moon appears soon after sunset — light that once let farmers harvest into the night.
When is the Harvest Moon?
September's full moon — the date shifts a little each year.See 2026 calendar
Why "Harvest"?
Unlike the other moons, the Harvest Moon is named for an event, not a month: it's the full moon closest to the autumn equinox. Around this time the Moon's orbit meets the horizon at a shallow angle, so it rises only ~25 minutes later each night instead of ~50 — giving farmers several evenings of bright early moonlight to bring in the crops.
What it looks like
For a few nights running, the Harvest Moon rises big and golden right around sunset in the east. The warm colour is the usual horizon effect — extra atmosphere reddening the low Moon — amplified by the 'moon illusion' that makes a horizon Moon look huge.
Frequently asked questions
Why does the Harvest Moon rise at almost the same time for several nights?
Near the September equinox the Moon's path makes a shallow angle with the horizon, so it rises only about 25 minutes later each night instead of the usual 50 — several evenings of early moonlight.
Is the Harvest Moon always in September?
Usually, but not always — it's the full moon nearest the autumn equinox, so about once every three years October's full moon is closer and takes the name instead.