Spring Equinox 2025 Date Usa. 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. The times of the solstices mark the beginning of summer and winter.
Spring will last from march 20. Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.