Official Day Of Fall 2025. The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd. In 2024 , the autumnal equinox will take place on.

The first day of fall in 2025, also known as the autumnal equinox, will be on september 23rd. There, the date of the autumnal equinox can change between march 19 and 21.