Spring And Fall Equinox 2024 Dates. Edt on march 19 (03:06 utc on march 20) in the northern hemisphere. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.
The fall equinox is not on the same day each year, though it always falls between. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.