What Date Is The First Day Of Spring 2024. Here's what happens on the first day of spring. Edt on march 19, 2024, the sun crosses the celestial equator from south to north.

But why does the day mark the start of spring and why only in the northern hemisphere?. Usually the equinox falls on the 20th of the month but — because it’s a leap year — it’s a day early in 2024.