First Day Of Fall 2024 Calendar Date. When is the first day of fall? The clocks will officially fall back at 2 a.m.

The official first day of fall, otherwise known as the autumnal equinox, is this weekend in the northern hemisphere. The first day of fall in 2024 arrives with the fall equinox on sunday, september 22, 2024, at 8:44 a.m.