When Is Spring Solstice 2025. The vernal equinox marks the beginning of astronomical spring, while the autumnal equinox marks the beginning of autumn. (december 21, 09:20 utc) 2025 spring equinox march 20 at 5:01 a.m., eastern daylight time.

What is daylight saving time? This is the date of the spring equinox in the julian calendar.