Spring Equinox 2025 Dates Usa. The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial. The first day of spring is march 20, 2024, at 5:02 a.m.

The first day of spring is march 20, 2024, at 5:02 a.m. Equinox means equal day and night (12 hours each).