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School Open
Dismissal: 3:30 PM
Next 7 Days
October 2026
Coming Up
School Breaks
Holidays (No School)
The San Mateo Union High School District school calendar for the 2026-27 school year runs from Wednesday, August 12, 2026 to Thursday, May 27, 2027 in California.
- •3 scheduled breaks and 11 holidays throughout the year
- •Spring break: Mar 29 – Apr 2
- •Winter break: Dec 21 – Jan 5
San Mateo Union High School District starts school 366 days later than most California districts. Winter break starts 364 days later than the most common California schedule.
Download the iCal file above to sync all San Mateo Union High School District dates with your phone or computer.
Frequently Asked Questions
Is San Mateo Union High School District school open today?
Yes, San Mateo Union High School District is open today. Check the weekly calendar above for upcoming school days and closures.
When is the next day off for San Mateo Union High School District?
The next day off is Monday, October 12, 2026 for Professional Development Day.
When is the first day of school for San Mateo Union High School District?
The first day of school for San Mateo Union High School District in 2026-27 is Wednesday, August 12, 2026.
When is the last day of school for San Mateo Union High School District?
The last day of school for San Mateo Union High School District in 2026-27 is Thursday, May 27, 2027.
When is spring break for San Mateo Union High School District?
Spring break for San Mateo Union High School District is Monday, March 29, 2027 to Friday, April 2, 2027.
When is winter break for San Mateo Union High School District?
Winter break for San Mateo Union High School District is Monday, December 21, 2026 to Tuesday, January 5, 2027.
When do students go back to school after winter break?
Students in San Mateo Union High School District return to school after winter break on Wednesday, January 6, 2027. Winter break ends on Tuesday, January 5, 2027.
When is Thanksgiving break for San Mateo Union High School District?
Thanksgiving break dates for San Mateo Union High School District are not yet available.
How do I add San Mateo Union High School District calendar to my phone?
Click the "Add to Calendar" button at the top of this page to download the iCal (.ics) file. Then:
iPhone/iPad: Tap the downloaded file, then tap "Add All" to add events to your Calendar app.
Android: Open the file with Google Calendar, review the events, and tap "Import".
Google Calendar (web): Go to Settings → Import & Export → Select the .ics file → Import.
Outlook: Double-click the file or drag it into your Outlook calendar.
Apple Calendar (Mac): Double-click the file or go to File → Import → select the .ics file.
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Other California Districts
Last updated: September 5, 2026
Source: San Mateo Union High School District Official Calendar