Summer Break 2025 Calendar. Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis. For links to each division’s academic calendar pages, please see divisional academic calendars.

Link to academic calendars for past and future years to see start and end dates of the term, official campus holidays, and dates for finals weeks. Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth’s axis.