What Day Is The First Day Of Fall 2025. When the autumnal equinox arrives in september each year, we greet the arrival of the autumn season. Here's everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and more!

Below are the dates for the first day of fall in 2025 and beyond: In 2025, the exact time of the start of fall is at 18:19 uct.