When Is The First Day Of Spring 2025 Date In The Us. When do the four seasons start in 2025—for spring, summer, fall, and winter? 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.

Summer begins with the summer solstice , friday, june 20, 2025, 10:42 p.m. Print date calendar for the spring 2025.