The First Day Of Spring 2025. But did you know there are actually three main definitions for the season coming from astronomy,. 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.

So many parts of the world will see the equinox arrive on march 19. What is the exact time of the start of spring in 2025?