Autumn Equinox 2025 Date And Time. In different time zones, the date of the equinox may differ by a day, so it is important to indicate your exact location. For 2025, the autumnal equinox falls on september 23rd.

Seasons divide the year into four distinct periods of time named spring, summer, autumn/fall, and winter. The following table shows the dates together with the exact time in which each of the seasons of the year begin.