When Is Autumn 2024 In Usa. Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in north america. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

Find out the date, how long in days until and count down to till autumn (or fall) 2024 with a countdown clock. Autumn equinox 2024 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator, moving from the northern hemisphere to the southern.