When Does Autumn Begin 2025. Autumn equinox 2025 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator, moving from the. What day is the fall (autumnal) equinox celebrated on?
The first day of fall 2025 arrives with the fall equinox on monday, september 22, 2025, 2:19 p.m. Here’s everything you should know about the fall equinoxโplus our favorite fall facts, folklore, photos, and more!