Fall 2025 Means Which Month. The first day of fall is sunday, september 22, 2025—the same day as the autumn equinox—in the northern hemisphere. For most of the united states, peak fall color arrives in the month of october.
In 2025, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. Fall 2025 means which month.