Autumnal Equinox 2024 Date. The vernal equinox marks the beginning of astronomical spring, while the autumnal equinox marks the beginning of autumn. These times are in coordinated universal time (utc).

When is the 2024 fall equinox? 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 hemisphere.