When Is Spring Equinox 2024 Schrikkeljaar. Nature will once again bring us the vernal equinox, the time of year that heralds the summer season in the northern hemisphere and the winter season in the southern. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.
This trend continues in 2024. On march 19, the vernal equinox will see spring come to the northern hemisphere as the sun reaches the spot where the ecliptic and celestial equator cross each other.