Charles Sumner - School District Calendar - Boston - 2025-2026

This Boston instructional academic school calendar is extremely important as it keeps you informed of Charles Sumner grading periods, early dismissal dates, staff development days and holidays for the Charles Sumner calendar school year 2025-2026. 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 Boston 2024-2025 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.