Fall Season 2024 Start Date Usa. The autumnal equinox, the astronomical start of fall, is sunday, sept. The first day of fall in 2024 arrives with the fall equinox on sunday, september 22, 2024, at 8:44 a.m.

All about the 2024 autumnal equinox. According to the national weather service, the exact time is 6:44 a.m.