When Does Spring Start And End 2025. 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. For those of us in the northern hemisphere, this is marked by the arrival of the spring equinox.

In the northern hemisphere, the astronomical start of spring, also known as the spring equinox, will occur on thursday, march 20, at 5:01 am edt in 2025. Spring starts at the moment when the sun is directly over the equator, going from south to north: