Mineral County School Calendar 2025-2026. The cobb county school calendar for the 2025 to 2026 school year begins on monday, august 4, 2025 and ends on wednesday, may 20, 2026. Students will start the school year on monday, august 11, 2025.

*teachers work from 7:30am to 7:30pm in lieu of one professional learning day. The more specific calendar will be available soon.