Vernal Equinox 2024 Date. The spring equinox (march 19, 2024) signals the start of spring in the northern hemisphere, the beginning of autumn in the southern hemisphere, and a rare moment of equal night across. What’s so special about this event?

In other words, on the day of the vernal equinox, day. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.