Fall Season 2024 Starts Date. The first day of fall in 2024 is sunday, sept. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

But are day and night actually equal length today? Autumn 2024 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth’s axis.