Fall Equinox 2024 Day. The official first day of fall is officially sunday, september 22, 2024. The 2024 fall equinox—also called the autumn equinox—takes place on sunday, september 22, 2024.
Autumnal equinox, two moments in the year when the sun is exactly above the equator and day and night are of equal length; When is the 2024 autumn equinox?