First Day Of Spring 2024 Usa. The march equinox comes at 11:06 p.m. This is also the start of the vernal equinox.

The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day and. The first day of spring is march 20, 2024, at 5:02 a.m.