When Is The First Day Of Spring 2025 Usa Time Zone. Daylight saving time begins at 2 a.m. Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.

Daylight saving time begins at 2 a.m. In the northern hemisphere, the astronomical start of spring, also known as the spring equinox, will occur on thursday, march 20, at 5:01 am edt in 2025.