Spring Equinox 2025 Usa Schedule. 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. The spring equinox, known as the vernal equinox in the northern hemisphere, is a day on which the sun sits directly over the equator, so day and night all over the world are of equal length.

For those of us in the northern hemisphere, this was marked by the arrival of the vernal. On this date, the day is equal.