Fall Equinox 2024 Runtime. Autumn starts this year on sunday 22 september and ends on 21 december 2024. Autumn equinox 2024 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator,.
In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. Understanding the autumn equinox 2024: