Spring Equinox 2025 Uk. The first day of spring in the uk astronomically occurs on the vernal equinox, 20 march 2025. It is often said that they begin and end at the solstices and equinoxes, so that, e.g., spring begins at the spring equinox (c.

But did you know there are actually three main definitions for the season coming from astronomy, meteorology and phenology? We greet the first day of the new season with the spring equinox, but what is it, exactly?