First Day Of Fall 2024 Equinox. When is the first day of fall? The first day of autumn often called fall (september equinox or autumnal equinox) is when the sun shines directly on the celestial equator passing from north to south and the.
The first day of fall is on sunday, september 22, 2024. On that day, the autumnal equinox will occur, marking the beginning of fall.