What Is The First Day Of Spring 2026. Spring will begin on thursday, march 20, 2025, once the vernal equinox (spring equinox) begins. Spring equinox 2026 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.

Find out the spring start and end dates for the years 2024, 2025 and 2026. The march or vernal equinox is when the sun crosses the.