Autumn 2025 Months And.  — in 2025, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. When does each season start in 2025?

The table below will allow you to view the autumn start and end dates for the years 2025, 2025 and 2026.  — when do the four seasons start in 2025—for spring, summer, fall, and winter?