2025 Summer Calendar Schedule Calendar Dates. The schedule of classes for summer 2025, fall 2025, and spring 2026 is available. 138 rows seasons calendar.

Some deadlines may exclude certain schools and college. 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.