Fall Equinox 2025 Date. Autumn 2025 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the. Autumn starts this year on sunday 22 september and ends on 21 december 2025.

In the northern hemisphere, the autumnal equinox takes place on september 22, 2025, at 12:44 gmt (08:44 a.m. As with the spring equinox this is a point of seasonal equilibrium.