First Day Of Summer 2025 Calendar. Click on the date that interests you to see the lighting map of the earth on that date and time (beginning of the season). The first day of summer, also known as the summer solstice, will occur on saturday, june 21, 2025, at 10:42 pm edt.
Some deadlines may exclude certain schools and colleges. All dates are tentative until closer to the beginning of the semester.