When Is Spring Equinox 2025 Uk. 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. For the spring equinox, this means it is the first day of the year when the day is longer than the night.

Spring equinox 20 march, summer solstice 21 june, autumn equinox 22 september, winter solstice 21 december. The first day of spring in the uk astronomically occurs on the vernal equinox, 20 march 2025.