First Day Of Fall 2024 Usa Time. However, as per utc timing, the first day of autumn is. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

The date varies slightly year to year, but it is. The autumnal equinox for the northern hemisphere and the first day of fall begin on the same day, at 8:44 a.m.