Spring Equinox 2024. 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 year, the spring equinox falls on wednesday 20 march, and the astronomical spring lasts until the summer solstice.

This is when the sun is exactly perpendicular to earth’s equator. Autumnal/fall equinox north of the equator is mirrored south of the equator by the spring equinox.