First Day Of Fall 2025 Date. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. The first day of fall in 2025, also known as the autumnal equinox, will be on september 23rd.
The first day of fall in 2025 falls on september 23rd. What is the exact time of the start of fall in 2025?