Spring Equinox 2025 Usa. When do the four seasons start in 2025—for spring, summer, fall, and winter? The first day of spring is march 20, 2024, at 5:02.
When is the first day of spring in 2025? 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.