First Day Of Autumn 2025 Usa Time. — the first day of fall in 2025 arrives with the fall equinox on sunday, september 22, 2025, at 8:44 a.m. On this day, days and nights are approximately (but not exactly) equal in length for everyone across.
Ct december 21 in 2025, according to. — in 2025, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.