Autumnal And Vernal Equinoxes 2025 Meaning. But what does that actually mean? The occurrence of spring equinox usually falls on the 20th or 21st march, and the autumnal equinox falls on 22nd or 23rd september every year.
22, according to the old farmer’s almanac. We celebrate the september equinox as the first day of autumn for the northern hemisphere, and the first.