When Is The First Day Of Summer 2024 Usa. Spring starts on march 1, summer on june 1, autumn on september 1, and winter on december 1. When is first day of summer in 2024 is thursday, june 20, and it lasts until sunday, september 22, inclusive.

This year, the first day of summer, also known as the summer solstice, is thursday, june 20. Because the earth rotates on a tilt, the summer solstice takes place when the northern.