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.
Visual Calendar
Official Calendar Images
Official calendar scans for Ontario-Montclair School District. Click any page to open the full-size image.
School Calendar
Interactive Calendar
Ontario-Montclair School District's 2026–2027 academic calendar — holidays, breaks, and key dates.
Month by Month Calendar
About the District
School Information
Details and contact information for Ontario-Montclair School District OMSD.
Sources and Checks
Where these dates come from
How the 2026–2027 Ontario-Montclair School District calendar on this page was compiled and what to re-check before you rely on it.
- ✓District publication. Dates are taken from the calendar Ontario-Montclair School District published for 2026–2027, shown as images on this page.
- ✓Official website. Cross-checked against omsd.net.
- ✓Board-approved version is used where the district marks one.
- ✓First and last day match the published calendar.
- ✓Breaks and holidays are listed with their full date ranges.
- ✓Teacher / no-school days are included where the district lists them.
- ✓Changes happen. Districts amend calendars mid-year — confirm with Ontario-Montclair School District before booking around a date.
Common Questions
Frequently Asked 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.
Explore More
Recently Updated Calendars
Other California school district calendars — recently added or updated.