Fall 2025 Date. In 2025, the last day of summer in the northern hemisphere is september 22! Astronomical fall, on the other hand, ends at the winter solstice, which this year happens on.
On that day, the autumnal equinox will occur, marking the beginning of fall. The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd.