When Is the First Day of Spring
The first day of spring in the Northern Hemisphere is the March equinox, which usually falls on March 20 or 21. In 2013, the vernal equinox occurred on March 20, marking the astronomical start of spring. The Southern Hemisphere experiences its first day of spring in September, around the September equinox.
What Happens on the First Day of Spring
On the first day of spring, the Sun crosses the celestial equator moving northward. Day and night are nearly equal in length worldwide. This shift leads to longer daylight hours, warmer temperatures, and the gradual melting of snow in many regions.
Spring and Seasonal Planning
For businesses and households, the first day of spring often signals the start of seasonal planning. Agriculture, retail, and energy sectors adjust schedules around changing daylight and weather patterns. Understanding the timing of the equinox helps organizations align planting, inventory, and marketing efforts with the season.
Learn more about equinoxes and seasonal cycles at EarthSky.
