What Time Is The First Day Of Spring For 2024. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet. But why does the day mark the start of spring and why only in the northern hemisphere?.

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. But why does the day mark the start of spring and why only in the northern hemisphere?.