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San Mateo Union High School District CA Calendar 26-27

  • 2026/27
  • California
  • 3 teacher days

Every published date for the San Mateo Union High School District 2026–27 school year. Breaks include Thanksgiving break Nov 26-27, winter break Dec 21 - Jan 5, and spring break Mar 29 - Apr 2. The table below lists all teacher workdays and holidays. Download the PDF calendar, or read the FAQs.

School year starts See full dates First day not published separately
School year ends See full dates Last day not published separately
Next key date — Counts down once the school year is under way

San Mateo Union High School District 2026-27 calendar

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San Mateo Union High School District school year calendar

Every published date for 2026–27, colour-coded by what happens that day.

  • Holiday - school closed
  • Break / vacation
  • Teacher / professional day
  • Early release / half day
  • Grading period / report cards
  • Other scheduled date

August 2026

  • Aug 10, 2026 — Fall Semester Begins (Teachers)
  • Aug 12, 2026 — Fall Semester Begins (Students)
  • Aug 10, 2026 — Professional Development Day

September 2026

  • Sep 7, 2026 — Labor Day
  • Sep 10, 2026 — Back to School Night
  • Sep 11, 2026 — Minimum Day
  • Sep 18, 2026 — 6-Week Marking Period

October 2026

  • Oct 12, 2026 — Professional Development Day
  • Oct 30, 2026 — 6-Week Marking Period

November 2026

  • Nov 11, 2026 — Veterans Day (Observance)
  • Nov 25, 2026 — Staff Recess (No School for Students)
  • Nov 26-27, 2026 — Thanksgiving Days

December 2026

  • Dec 16-17, 2026 — Minimum Day
  • Dec 18, 2026 — 6-Week Marking Period
  • Dec 18, 2026 — Fall Semester Ends (Students)
  • Dec 21, 2026 - Jan 5, 2027 — Winter Recess

January 2027

  • Dec 21, 2026 - Jan 5, 2027 — Winter Recess
  • Jan 5, 2027 — Fall Semester Ends (Teachers)
  • Jan 6, 2027 — Spring Semester Begins (Teachers)
  • Jan 6, 2027 — Spring Semester Begins (Students)
  • Jan 18, 2027 — Martin Luther King Jr. Day

February 2027

  • Feb 15, 2027 — Presidents' Day
  • Feb 19, 2027 — 6-Week Marking Period

March 2027

  • Mar 11, 2027 — Open House
  • Mar 12, 2027 — Minimum Day
  • Mar 29 - Apr 2, 2027 — Spring Recess

April 2027

  • Mar 29 - Apr 2, 2027 — Spring Recess
  • Apr 9, 2027 — 6-Week Marking Period

May 2027

  • May 25-27, 2027 — Minimum Day
  • May 27, 2027 — Spring Semester Ends (Students)
  • May 28, 2027 — Spring Semester Ends (Teachers)
  • May 31, 2027 — Memorial Day

June 2027

July 2027

San Mateo Union High School District teacher and staff days 2026/27

Students normally stay home on these days. Confirm with the district before making plans.

  • Aug 10, 2026 Professional Development Day District source
  • Oct 12, 2026 Professional Development Day District source
  • Jan 25-26, 2027 Professional Development Day District source

San Mateo Union High School District breaks and holidays

School is closed to students on these dates.

  • Sep 7, 2026 Labor Day Holiday
  • Nov 11, 2026 Veterans Day (Observance) Holiday
  • Nov 25, 2026 Staff Recess (No School for Students) Break
  • Nov 26-27, 2026 Thanksgiving Days Holiday
  • Dec 21, 2026 - Jan 5, 2027 Winter Recess Break
  • Jan 18, 2027 Martin Luther King Jr. Day Holiday
  • Feb 15, 2027 Presidents' Day Holiday
  • Mar 29 - Apr 2, 2027 Spring Recess Break
  • May 31, 2027 Memorial Day Holiday

Your checked 2026/27 San Mateo Union High School District planning calendar

How these dates are put together, and what to double-check before you book anything.

Useful now31 published dates for the 2026–27 school year, laid out month by month.
CheckedTaken from the district’s own published calendar, not retyped from memory.
Kept currentLast updated May 14, 2026.
Full term dates table

San Mateo Union High School District 2026–27 calendar dates

DateEvent
Aug 10, 2026Fall Semester Begins (Teachers)
Aug 12, 2026Fall Semester Begins (Students)
Aug 10, 2026Professional Development Day
Sep 7, 2026Labor Day
Sep 10, 2026Back to School Night
Sep 11, 2026Minimum Day
Sep 18, 20266-Week Marking Period
Oct 12, 2026Professional Development Day
Oct 30, 20266-Week Marking Period
Nov 11, 2026Veterans Day (Observance)
Nov 25, 2026Staff Recess (No School for Students)
Nov 26-27, 2026Thanksgiving Days
Dec 16-17, 2026Minimum Day
Dec 18, 20266-Week Marking Period
Dec 18, 2026Fall Semester Ends (Students)
Dec 21, 2026 - Jan 5, 2027Winter Recess
Jan 5, 2027Fall Semester Ends (Teachers)
Jan 6, 2027Spring Semester Begins (Teachers)
Jan 6, 2027Spring Semester Begins (Students)
Jan 18, 2027Martin Luther King Jr. Day
Jan 25-26, 2027Professional Development Day
Feb 15, 2027Presidents' Day
Feb 19, 20276-Week Marking Period
Mar 11, 2027Open House
Mar 12, 2027Minimum Day
Mar 29 - Apr 2, 2027Spring Recess
Apr 9, 20276-Week Marking Period
May 25-27, 2027Minimum Day
May 27, 2027Spring Semester Ends (Students)
May 28, 2027Spring Semester Ends (Teachers)
May 31, 2027Memorial Day

San Mateo Union High School District Calendar 26-27 Revised FAQs

When is the first day of school for San Mateo Union High School District Calendar 2026-2027?
The first day of school for students in San Mateo Union High School District for the 2026-2027 school year is August 12, 2026.
When is Spring Break in San Mateo Union High School District Calendar 2026-2027?
Spring Break in San Mateo Union High School District for the 2026-2027 school year is from March 29, 2027 through April 2, 2027.
When is Christmas Break in San Mateo Union High School District Calendar 2026-2027?
Christmas Break in San Mateo Union High School District for the 2026-2027 school year begins on December 21, 2026.
When is Winter Break in San Mateo Union High School District Calendar 2026-2027?
Winter Break in San Mateo Union High School District for the 2026-2027 school year is from December 21, 2026 to January 5, 2027.
When is Thanksgiving Break in San Mateo Union High School District Calendar 2026-2027?
Thanksgiving Break in San Mateo Union High School District for the 2026-2027 school year is on November 26-27, 2026.
What is the last day of school in San Mateo Union High School District Calendar 2026-2027?
The last day of school for students in San Mateo Union High School District for the 2026-2027 school year is May 27, 2027.
When is Labor Day in San Mateo Union High School District Calendar 2026-2027?
Labor Day in San Mateo Union High School District for the 2026-2027 school year is September 7, 2026.
When is Martin Luther King Jr. Day in San Mateo Union High School District Calendar 2026-2027?
Martin Luther King Jr. Day in San Mateo Union High School District for the 2026-2027 school year is January 18, 2027.
When is Presidents' Day in San Mateo Union High School District Calendar 2026-2027?
Presidents' Day in San Mateo Union High School District for the 2026-2027 school year is February 15, 2027.
When is Memorial Day in San Mateo Union High School District Calendar 2026-2027?
Memorial Day in San Mateo Union High School District for the 2026-2027 school year is May 31, 2027.

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San Mateo Union High School District calendar FAQs

When is the first day of school for San Mateo Union High School District Calendar 2026-2027?
The first day of school for students in San Mateo Union High School District for the 2026-2027 school year is August 12, 2026.
When is Spring Break in San Mateo Union High School District Calendar 2026-2027?
Spring Break in San Mateo Union High School District for the 2026-2027 school year is from March 29, 2027 through April 2, 2027.
When is Christmas Break in San Mateo Union High School District Calendar 2026-2027?
Christmas Break in San Mateo Union High School District for the 2026-2027 school year begins on December 21, 2026.
When is Winter Break in San Mateo Union High School District Calendar 2026-2027?
Winter Break in San Mateo Union High School District for the 2026-2027 school year is from December 21, 2026 to January 5, 2027.
When is Thanksgiving Break in San Mateo Union High School District Calendar 2026-2027?
Thanksgiving Break in San Mateo Union High School District for the 2026-2027 school year is on November 26-27, 2026.
What is the last day of school in San Mateo Union High School District Calendar 2026-2027?
The last day of school for students in San Mateo Union High School District for the 2026-2027 school year is May 27, 2027.
When is Labor Day in San Mateo Union High School District Calendar 2026-2027?
Labor Day in San Mateo Union High School District for the 2026-2027 school year is September 7, 2026.
When is Martin Luther King Jr. Day in San Mateo Union High School District Calendar 2026-2027?
Martin Luther King Jr. Day in San Mateo Union High School District for the 2026-2027 school year is January 18, 2027.
When is Presidents' Day in San Mateo Union High School District Calendar 2026-2027?
Presidents' Day in San Mateo Union High School District for the 2026-2027 school year is February 15, 2027.
When is Memorial Day in San Mateo Union High School District Calendar 2026-2027?
Memorial Day in San Mateo Union High School District for the 2026-2027 school year is May 31, 2027.

Dates can change after publication. Read our calendar disclaimer.