The start date for the CMS (Charlotte-Mecklenburg Schools) 2025 school year is August 25, 2025. This is the first day of school for students after teacher workdays from August 18 to 22, 2025.

If the question refers to a different CMS school (e.g., Cambridge Maths School, Cambridge Middle School NZ, Cupertino Middle School), those have different start dates which I can provide upon request.