Spring Equinox 2024 Usa. The spring equinox officially starts at 8:06 p.m. The precise timing of the equinox, when the sun crosses directly over the earth’s equator, varies each year due to the intricate mechanics of earth’s orbit.

What is the spring equinox and what happens on this day?. The spring, or vernal, equinox occurs tuesday, march 19, at 11:06 p.m.