Union County Calendar 2025-26. 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. Mcdonough — as the henry county school system is getting ready for the first day of school on aug.

A draft version of the calendar can be viewed online, with a comparison to the current. The marietta city school calendar for the 2025 to 2026 school year begins on friday, august 1, 2025 and ends on friday, may 22, 2026.