Spring Equinox 2025 Usa 2024. 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 reason has to do with how each are defined.
Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the. Fall begins with the autumnal equinox, monday, september 22,.