Visual Calendar
Official calendar scans for Ontario-Montclair School District. Click any image to open full-screen.
School Calendar
Download Ontario-Montclair School District's 2026–2027 academic calendar PDF — holidays, breaks, and key dates.
For the 2026–2027 school year, the district serves 20,000 students across 30 schools in Southern California, California. Classes begin August 5, 2026 and end May 20, 2027, with 180 instructional days planned. All dates listed below are sourced from the district's official publications. Verify with Ontario-Montclair School District before scheduling around them.
About the District
Details and contact information for Ontario-Montclair School District.
Common Questions
Ontario-Montclair School District Calendar 2026–2027 — important dates and answers.
The first day for students in Ontario-Montclair School District for the 2026-2027 school year is August 5, 2026.
Spring Break in Ontario-Montclair School District runs from March 29 to April 2, 2027.
Christmas Break in Ontario-Montclair School District begins on December 18, 2026 and continues through January 1, 2027.
Winter Break in Ontario-Montclair School District takes place from December 18, 2026 through January 1, 2027.
Thanksgiving Break for Ontario-Montclair School District is scheduled from November 23 to November 27, 2026.
The last day for students in Ontario-Montclair School District for the 2026-2027 school year is May 20, 2027.
Labor Day is observed on September 7, 2026 and schools are closed.
Martin Luther King Jr. Day is observed on January 18, 2027 in Ontario-Montclair School District.
Presidents' Day is observed on February 15, 2027 and schools are closed.
Memorial Day will be observed on May 31, 2027.
Juneteenth (observed) will take place on June 18, 2027.
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Other California school district calendars — recently added or updated.