When Is Fall 2025 Start Date. According to the farmer's almanac, the exact time of the autumnal equinox in the. In 2025, the first day of fall, also known as the autumnal equinox, is sunday, sept.
But this year, according to the national weather service, it falls on sept. Autumn 2025 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth’s axis.