Spring Equinox Date 2025. In 2025, the spring equinox occurs on march 19. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.

Spring 2025 starts on tuesday, march 19th in the northern hemisphere, with daylight time lengthening and the leaves begining show on the trees with the changing tilt of the earth’s axis. In 2025, the official first day of spring is tuesday, march 19.