When Is Spring Equinox 2024. The vernal equinox arrives on tuesday, marking the start of the spring season for the northern. Spring equinox 2024 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.
This event marks the official start of autumn in the northern. The vernal equinox arrives on tuesday, march 19, marking the start of the spring season for the northern hemisphere.