Fall Equinox 2025 Time And Date. The occurrence of spring equinox usually falls on the 20th or 21st march, and the autumnal equinox falls on 22nd or 23rd september every year. The autumnal equinox occurs on september 22nd each year, although the exact date and time may vary due to the earth’s orbit.
What is the fall equinox? Autumn 2025 starts on monday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth’s axis.