When Is The Fall Equinox 2025 Usa. What is the fall equinox? Starts on september 22, 2025, at 8:44 am and lasts until december 21, 2025, at 4:21 am (93 days) winter:
Starts on september 22, 2025, at 8:44 am and lasts until december 21, 2025, at 4:21 am (93 days) winter: 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.