When Is The First Day Of Autumn 2024. From this point on, daylight in the northern hemisphere will gradually grow shorter until the winter solstice, which occurs on dec. The first day of fall in the northern hemisphere is sunday, sept.

The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd. The fall equinox is the first day of autumn in the northern hemisphere.