First Day Of Spring 2024 Usa Time. When is the first day of spring in 2024 happening? Pdt (and 03:06 gmt on wednesday) the sun will cross the celestial equator traveling north, marking the vernal equinox in the northern.

 — because spring began even earlier, at 11:06 p.m.  — spring 2024 starts on tuesday, march 19th in the northern hemisphere,.