When Is The Fall Equinox 2025 Eastern Time. America the exact moment of the autumnal equinox in 2025 is 22 september , at 20:19:18. The first day of autumn often called fall (september equinox or autumnal equinox) is when the.
The first day of autumn is in 2025 on september 22 (according to the astronomical definition). Autumnal equinox on sunday, september 22, 2025.