When Is The First Day Of Summer 2025. When is the first day of summer this year 2024 in 2024, the first day of summer takes place on thursday, june 20th. Find out the date, how long in days until and count down to till summer 2025 with a countdown clock.

The following table shows the dates together with the exact time in which each of the seasons of the year begin. The first day of summer, also known as the summer solstice, will occur on saturday, june 21, 2025, at 10:42 pm edt.