When Is The 1st Day Of Spring 2025 In The Us. What is the exact time of the start of spring in 2025? The first day of spring, also known as the vernal equinox, falls around march 20th or 21st each year in the northern.

Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic. The seasons are defined as spring (march, april, may), summer (june, july, august), autumn.