First Day Spring 2024 Usa. Leap years are caused by earth's rotation. In 2024, the march equinox will occur on tuesday, march 19, at 11:06 p.m.

The first day of spring is march 20, 2024, at 5:02 a.m. First day of spring in 2024 is on tuesday, the 19th of march (19/3/2024).