First Day Of Fall 20254

First Day Of Fall 20254. The autumnal equinox is an astronomical event. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. The first day of fall is sunday, september 22, 2024—the same day as the autumn equinox—in the northern hemisphere.