Black Diamond Middle - School District Calendar - Antioch Unified - 2026-2027

This Antioch Unified instructional academic school calendar is extremely important as it keeps you informed of Black Diamond Middle grading periods, early dismissal dates, staff development days and holidays for the Black Diamond Middle calendar school year 2026-2027. As a parent and or student, you will find yourself needing this information on a regular basis, so please "like" and bookmark this page in a visible location within your favorite browser. The legend for this Antioch Unified 2026-2027 calendar is at the bottom of the page. If you are browsing on your PC there is another copy of the legend in the right hand column.