Spring Equinox 2025 Time In Usa. First day of spring in usa and uk, when is spring vernal equinox in usa 2025? 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.

It’s time for the spring equinox. On this date, the day is equal.