When Does Spring Start 2025 Uk Calendar. Spring equinox / astronomical spring the beginning of spring is a astronomical event associated with the spring equinox, which marks one of the two times in the year when the earth's axis is. Spring 2025 starts on thursday, march 20th in the northern hemisphere, with daylight time lengthening and the leaves begining show on the trees with the changing tilt of the earth's axis.
The seasons are defined as spring (march, april, may), summer (june, july, august), autumn (september,. But when does the season officially start in the uk and what exactly is the spring equinox?