What Day Is The First Day Of Spring 2025 In America. 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. The first day of spring is march 20, 2024, at 5:02 a.m.
It is also the point in the calendar where the day length is more or less equal to the. What is the spring equinox and what happens on.