Start Of Fall 2025. Next autumnal equinox (start of fall) monday, 22 september 2025 the autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd. Winter starts at the moment when the sun is farthest south:
How many days until autumn (or fall) 2025? Find out the autumn (fall) start and end dates for the years 2024, 2025 and 2026.