Start Of Spring 2025 Date In Usa. Fall begins with the autumnal equinox , monday, september 22, 2025, 2:19. 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.

On this date, the day is equal. When is the first day of spring in 2025?