Fall Equinox 2024 Dates Usa. 21, 2024, in the northern hemisphere until thursday, march 20, 2025, when the vernal equinox will mark the beginning of spring. The first day of fall in 2024 arrives with the fall equinox on sunday, september 22, 2024, at 8:44 a.m.

When is the first day of fall 2024? The first day of fall is sunday, september 22, 2024—the same day as the autumn equinox—in the northern hemisphere.