Official Day Of Spring 2025. The first day of spring in the uk astronomically occurs on the vernal equinox, 20 march 2025. This evening, we will have a change of the seasons:
While itโs the first day of astronomical spring in north america, europe and asia, summer transitions to autumn in the southern hemisphere. The spring equinox is tuesday, march 19 and brings the first day of astronomical spring to the northern hemisphere.