First Day of School
Wed, August 6, 2025
Official district calendar Updated June 3, 2026 Official
Check first day, last day, month-by-month dates, printable PDF, and calendar subscription links for Mt. Diablo Unified School District. The school year runs from Aug 6, 2025 to Jun 2, 2026.
Wed, August 6, 2025
Mon, September 1, 2025
Mon, October 13, 2025
Tue, November 11, 2025
Nov 24-28, 2025
Dec 22, 2025 - Jan 2, 2026
Mon, January 19, 2026
Mon, February 16, 2026
Tue, March 31, 2026
Apr 6-13, 2026
Mon, May 25, 2026
Tue, June 2, 2026
| Event | Date(s) | Status |
|---|---|---|
| First Day of School | Wed, August 6, 2025 | School Opens |
| Labor Day | Mon, September 1, 2025 | No School |
| Indigenous Peoples' Day | Mon, October 13, 2025 | No School |
| Veterans Day | Tue, November 11, 2025 | No School |
| Thanksgiving Break | Nov 24-28, 2025 | No School |
| Winter Break | Dec 22, 2025 - Jan 2, 2026 | No School |
| Martin Luther King Jr. Day | Mon, January 19, 2026 | No School |
| Presidents' Day | Mon, February 16, 2026 | No School |
| Cesar Chavez Day | Tue, March 31, 2026 | No School |
| Spring Break | Apr 6-13, 2026 | No School |
| Memorial Day | Mon, May 25, 2026 | No School |
| Last Day of School | Tue, June 2, 2026 | School Closes |
Complete month-by-month calendar for Mt. Diablo Public Schools. Every day is color-coded so you can see school days, holidays, and breaks at a glance.
Mt. Diablo Unified School District in 2025-2026 opens on the earlier side of the school-year cycle on Aug 6, 2025 and runs into the first week of June on Jun 2, 2026. The main break blocks to plan around are Thanksgiving Break (Nov 24-28, 2025), Winter Break (Dec 22, 2025 - Jan 2, 2026), and Spring Break (Apr 6-13, 2026). Spring Break lands later than the March-heavy recess pattern some districts use.
The early start can affect summer camp, childcare, and back-to-school travel timing. The early-June finish keeps the year close to the standard late-spring wrap-up pattern. Thanksgiving is shown as a full-week break. These details can affect childcare coverage, trip timing, and when to recheck school-site announcements.
Outside those major breaks, there are a couple of standalone no-school days worth watching. The notes also flag conference-related minimum days that can shorten the student week. This calendar also calls out district-specific closures such as Indigenous Peoples' Day and Cesar Chavez Day. Beyond the three headline breaks, the details to scan include named schedule items such as Student Holiday.
The calendar dates on this page are checked against district-published materials; families should still verify late changes against the official district calendar page.
Mt. Diablo Unified School District starts school on Aug 6, 2025 and the student year ends on Jun 2, 2026.
The longest no-school windows are Thanksgiving Break (Nov 24-28, 2025), Winter Break (Dec 22, 2025-Jan 2, 2026), and Spring Break (Apr 6-13, 2026).
Beyond the standard statewide holidays, the published calendar also names Indigenous Peoples' Day and Cesar Chavez Day.
Mt. Diablo Unified School District starts school on Aug 6, 2025 for 2025-2026, which is an early-August opening by California district standards.
Winter Break runs from Dec 22, 2025 - Jan 2, 2026, so students return relatively soon after New Year's.
Data Source: This calendar is compiled from the official Mt. Diablo Unified School District calendar PDF.
Disclaimer: This website is not affiliated with Mt. Diablo Unified School District or the California Department of Education. While we strive for accuracy, always verify important dates with the official district website.