First Day Of Spring 2024 In Uk. Spring equinox 2024 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic. The first day of spring in the uk astronomically occurs on the vernal equinox, 20 march 2025.

Find out more in our guide. The seasons are defined as spring (march, april, may), summer (june, july, august), autumn (september,.