Spring Vernal Equinox 2024 Dates. The equinox in the northern hemisphere occurs twice a year around 20 march (the spring equinox) and around 22 september (the autumn equinox). The vernal equinox arrives on tuesday, march 19, marking the start of the spring season for the northern hemisphere.
When do the four seasons start in 2024โfor spring, summer, fall, and winter? Ireland equinox and solstice dates.