The four seasons of the year in the United States —spring, summer, fall, and winter — are what determine the weather, the ecosystem, and the hours of daylight throughout the year. Spring starts on March 20 or 21 and lasts until June 20 or 21. The first day of spring occurs on the spring equinox, which marks the astronomical beginning of spring. Meteorologically, spring begins on March 1st. This season comes after winter and before summer and is characterized by warm temperatures and the days getting longer. It is during spring that plants start blossoming for the summer.

Source: Calendarr