When Will The Fall Equinox Happen 2024. The autumnal equinox marks the first day of fall in the northern hemisphere. The equinoxes occur around march 20 and september 22 each year, corresponding to an equal length of day and night.
Cdt) and will last until the winter solstice on saturday, december 21, 2024, at 10:21 a.m. Find out more about equinoxes and solstices.