For the 2026–2027 school year, the district serves 8,700 students across 11 schools in California. The 2026–2027 academic year includes 180 instructional days. All dates listed below are sourced from the district's official publications. Verify with San Mateo Union High School District SMUHSD before scheduling around them.
Visual Calendar
Official Calendar Images
Official calendar scans for San Mateo Union High School District SMUHSD. Click any page to open the full-size image.
School Calendar
Interactive Calendar
San Mateo Union High School District SMUHSD's 2026–2027 academic calendar — holidays, breaks, and key dates.
Month by Month Calendar
About the District
School Information
Details and contact information for San Mateo Union High School District SMUHSD.
Sources and Checks
Where these dates come from
How the 2026–2027 San Mateo Union High School District SMUHSD calendar on this page was compiled and what to re-check before you rely on it.
- ✓District publication. Dates are taken from the calendar San Mateo Union High School District SMUHSD published for 2026–2027, shown as images on this page.
- ✓Official website. Cross-checked against smuhsd.org.
- ✓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 San Mateo Union High School District SMUHSD before booking around a date.
Common Questions
Frequently Asked Questions
San Mateo Union High School District SMUHSD Calendar 2026–2027 — important dates and answers.
The first day of school for students in San Mateo Union High School District for the 2026-2027 school year is August 12, 2026.
Spring Break in San Mateo Union High School District for the 2026-2027 school year is from March 29, 2027 through April 2, 2027.
Christmas Break in San Mateo Union High School District for the 2026-2027 school year begins on December 21, 2026.
Winter Break in San Mateo Union High School District for the 2026-2027 school year is from December 21, 2026 to January 5, 2027.
Thanksgiving Break in San Mateo Union High School District for the 2026-2027 school year is on November 26-27, 2026.
The last day of school for students in San Mateo Union High School District for the 2026-2027 school year is May 27, 2027.
Labor Day in San Mateo Union High School District for the 2026-2027 school year is September 7, 2026.
Martin Luther King Jr. Day in San Mateo Union High School District for the 2026-2027 school year is January 18, 2027.
Presidents' Day in San Mateo Union High School District for the 2026-2027 school year is February 15, 2027.
Memorial Day in San Mateo Union High School District for the 2026-2027 school year is May 31, 2027.
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Other California school district calendars — recently added or updated.