First Day Of Spring 2024 Calendar. What is the spring equinox and what happens on this day? In the northern hemisphere, the astronomical start of spring is also known as the spring equinox.
For the official calendar, please click here. Spring 2024 starts on tuesday, march 19th 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.