When Is First Day Of Autumn 2024. Leaves begin to change color as soon as early september in some parts of the u.s. This year, the autumn equinox will begin on sunday, september 22, 2024, at 12:44 utc (7:44 a.m.

Mark your calendars for sunday, sept. First day of fall in 2024 is on sunday, the 22nd of september (22/9/2024).