First Day Of Autumn 2024 Usa Calendar. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. Here are the equinox and solstice dates—plus, answers to common questions about the seasons of.
* the dates of fall given on this. In 2024 , the autumnal equinox will take place on september 22,at 08:44 a.m.