First Day Of Fall 2024 Equinox Calendar. 22, when the sun crosses the celestial equator going from north to south. In different time zones, the date of the equinox may differ by a day, so it is important to indicate your exact location.

The first day of fall is sunday, september 22, 2024—the same day as the autumn equinox—in the northern hemisphere. When do the four seasons start in 2024—for spring, summer, fall, and winter?