First Day Of Fall 2024 Countdown Clock. You can also calculate the days manually or. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

In 2024, this happens on september 22, at 12:44 gmt (08:44 a.m. Autumn 2024 starts on sunday, 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.