When Is Summer 2025 Start Date. Pursuing a bachelor’s degree, with an expected graduation date between december 2025 and. 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 having reached its furthest tilt and begins to change directiion back.

Find out the date, how long in days until and count down to till summer 2025 with a countdown clock. The duration of the summer program regardless of which start/end option is 11 weeks.