When Does Summer Start 2025 California Department. Calendars for events, conferences, and other programs with important deadlines. But each school district sets slightly different dates for the first day of school,.

The start of summer in 2025 will occur slightly later than in 2024. 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.