First Day Of Summer 2025 In California. 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. School starts on august 12, 2024.

These dates may be modified as official changes are announced, so please check back regularly for updates. 25 nov 2024 (mon) 29 nov 2024 (fri) christmas break: