We greet the first day of the new season with the spring equinox, but what is it, exactly? And why does the first day of spring change? — When Is The First Day Of Spring In 2023? The first day of spring is Monday, March 20, 2023, at 5:24 p.m. EDT. For those of us in the Northern Hemisphere, this was marked by the arrival of the Vernal Equinox (otherwise known as the “First Point of Aries“). Traditionally, we celebrate the first day of spring on March…