Spring Equinox 2025 Northern Hemisphere. For those of us in the northern hemisphere, this is marked by the arrival of the spring equinox (otherwise known as the “first point of aries”). What day is the spring equinox 2024/2025?

The spring equinox marks the astronomical beginning of spring when the sun crosses the celestial equator moving northward. 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.