Fall Equinox 2024 Dates Usa. The fall equinox in 2024 happened on september 22. Autumnal equinox marks the end of summer and the beginning of fall.

This sunday, the autumnal equinox is upon us, and with it, a shift to shorter days, longer nights and the astronomical start of fall in the northern. This page provides date and time for autumnal equinox in the year 2024 for phoenix, arizona, united states.