Summer 2025 Start Date. 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. January 1, 2025 new years day january 6, 2025 new student orientation january 7, 2025 new student orientation january 8, 2025 start of classes (1st day) january 15, 2025.
* the dates of summer given on this page are for the northern hemisphere. Semester dates for the 2025/26 academic year.