When Is The First Day Of Spring 2024. When is the first day of spring in 2024? Fall begins with the autumnal equinox, sunday, september 22,.

The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day and night are almost the same. On the equinoxes, the earth’s axis and orbit line up so both hemispheres get the same amount of sunlight.