When Is The First Day Of Spring 2024 Usa. The spring equinox is tuesday, march 19 and brings the first day of astronomical spring to the northern hemisphere.  — here's what happens on the first day of spring.

 — 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. Spring 2024 starts on friday and ends on friday.