When Is The 1st Day Of Fall 2025 Start. The first day of fall this year, also known as the autumnal equinox is sunday, sept. I f you are in the eastern time zone, then fall officially begins at 8:43 a.m., local time.

The first day of fall this year, also known as the autumnal equinox is sunday, sept. In 2025, the fall equinox in the united states will occur on sunday, sept.