First Day Of Spring Summer Fall Winter 2024 Usa. โ in 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. The first day of fall in 2024 arrives with the fall equinox on sunday, september 22, 2024, at 8:44 a.m.
1 and winter on dec. What is the fall equinox?