First Day Of Spring 2025 Usa Calendar. It is also called the spring quinox. When do the four seasons start in 2025—for spring, summer, fall, and winter?

When is the first day of spring in 2025 happening? 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.