- School starts Wednesday, Aug. 12, 2026 and ends Thursday, May 27, 2027, an early release day.
- Thanksgiving break: Nov. 25 to 27. Students are out Wednesday, Nov. 25 to Sunday, Nov. 29, back Monday, Nov. 30.
- Winter recess: Dec. 21 to Jan. 4. Students are out Saturday, Dec. 19 to Tuesday, Jan. 5, back Wednesday, Jan. 6.
- Spring recess: March 29 to April 2. Students are out Saturday, March 27 to Sunday, April 4, back Monday, April 5.
- Eight early release days for every school. Details below.
The SMUHSD 2026-27 calendar
This is the district's own calendar, as SMUHSD publishes it. Tap it to open the full-size image.
Add the SMUHSD calendar to your phone
Pick a file. Each one is an all-day event per day off or half day, and a break is one event across all its days.
Every date
First and last day, every day off, every early release and grading period dates. 23 events.
Download .ics
Holidays and breaks
Only the days with no school. 10 events.
Download .ics
Early release days
Only the half days. 8 events.
Download .ics
On an iPhone
Tap a file above, then tap Add All. The dates go into the calendar you choose.
In Google Calendar
On a computer, open Google Calendar, then Settings, then Import & export. Choose the file and the calendar to add it to. The dates show up on your Android phone too.
In Outlook
Open the downloaded file, or in Outlook on the web go to Add calendar, then Upload from file.
These files are a copy of the calendar today. If the district changes a date, download the file again.
SMUHSD vacations and holidays, 2026-27
Every day with no school for students, from the first day to the last: 10 entries and 27 weekdays in all.
| Day off | Dates | Days of the week | School days off |
|---|---|---|---|
| Labor Day Holiday | Sept. 7 | Mon | 1 |
| Professional development day Staff day | Oct. 12 | Mon | 1 |
| Veterans Day Holiday | Nov. 11 | Wed | 1 |
| Thanksgiving break Break | Nov. 25 to 27 | Wed to Fri | 3 |
| Winter recess Break | Dec. 21 to Jan. 4 | Mon to Mon | 11 |
| Teacher workshop day Staff day | Jan. 5 | Tue | 1 |
| Martin Luther King Jr. Day Holiday | Jan. 18 | Mon | 1 |
| Professional development days Staff day | Jan. 25 to 26 | Mon to Tue | 2 |
| Presidents Day Holiday | Feb. 15 | Mon | 1 |
| Spring recess Break | March 29 to April 2 | Mon to Fri | 5 |
SMUHSD early release days
Eight early release days in all.
| Date | Day | What | Dismissal | Who |
|---|---|---|---|---|
| Sept. 11 | Fri | Minimum day | Times vary by school | All students |
| Dec. 16 | Wed | Minimum day | Times vary by school | All students |
| Dec. 17 | Thu | Minimum day | Times vary by school | All students |
| Dec. 18 | Fri | Minimum day, end of fall semester | Times vary by school | All students |
| March 12 | Fri | Minimum day | Times vary by school | All students |
| May 25 | Tue | Minimum day | Times vary by school | All students |
| May 26 | Wed | Minimum day | Times vary by school | All students |
| May 27 | Thu | Minimum day, last day of school | Times vary by school | All students |
Where the time varies by school, your school sends its own dismissal time.
Calendar notes: what to plan around
Long weekends and breaks
Every stretch of three or more days with no school, counting weekends. A half day next to a weekend adds half a day.
- 3-day weekend: Saturday, Sept. 5 to Monday, Sept. 7. Labor Day. Back Tuesday, Sept. 8.
- 2.5-day weekend: Friday, Sept. 11 at early dismissal to Sunday, Sept. 13. Minimum day. Back Monday, Sept. 14.
- 3-day weekend: Saturday, Oct. 10 to Monday, Oct. 12. Professional development day. Back Tuesday, Oct. 13.
- 5-day weekend: Wednesday, Nov. 25 to Sunday, Nov. 29. Thanksgiving break. Back Monday, Nov. 30.
- 18.5 days off in a row: Friday, Dec. 18 at early dismissal to Tuesday, Jan. 5. Minimum day, end of fall semester, winter recess and teacher workshop day. Back Wednesday, Jan. 6.
- 3-day weekend: Saturday, Jan. 16 to Monday, Jan. 18. Martin Luther King Jr. Day. Back Tuesday, Jan. 19.
- 4-day weekend: Saturday, Jan. 23 to Tuesday, Jan. 26. Professional development days. Back Wednesday, Jan. 27.
- 3-day weekend: Saturday, Feb. 13 to Monday, Feb. 15. Presidents Day. Back Tuesday, Feb. 16.
- 2.5-day weekend: Friday, March 12 at early dismissal to Sunday, March 14. Minimum day. Back Monday, March 15.
- 9 days off in a row: Saturday, March 27 to Sunday, April 4. Spring recess. Back Monday, April 5.
Two early releases on a Friday or Monday make a 2.5-day weekend.
Weeks with fewer than five school days
Ten weeks have fewer than five school days, and three weeks have none at all.
| Week of | School days | Why |
|---|---|---|
| Aug. 10 | 3 | Before the first day |
| Sept. 7 | 4 | Labor Day |
| Oct. 12 | 4 | Professional development day |
| Nov. 9 | 4 | Veterans Day |
| Nov. 23 | 2 | Thanksgiving break |
| Dec. 21 | 0 | Winter recess |
| Dec. 28 | 0 | Winter recess |
| Jan. 4 | 3 | Winter recess and teacher workshop day |
| Jan. 18 | 4 | Martin Luther King Jr. Day |
| Jan. 25 | 3 | Professional development days |
| Feb. 15 | 4 | Presidents Day |
| March 29 | 0 | Spring recess |
| May 24 | 4 | After the last day |
Teacher workdays: no school for students
Three of the days off are staff days. Teachers work; students stay home. Plan child care as you would for a holiday.
- Monday, Oct. 12: professional development day
- Tuesday, Jan. 5: teacher workshop day
- Monday, Jan. 25 to Tuesday, Jan. 26: professional development days
Makeup days
The calendar names no makeup days. If school closes for weather, the district announces how the day is made up.
Also worth knowing
- The calendar lists no parent-teacher conference days.
- The calendar lists no testing dates.
- After the last day, the calendar still shows teacher workshop day (May 28) and Memorial Day (May 31). Students are already out.
First and last day of school
Aug. 12First day, Wednesday
May 27Last day, Thursday
180School days, by our count
27Weekdays off between them
The first day of school is Wednesday, Aug. 12, 2026. The last day is Thursday, May 27, 2027, with early dismissal.
Teachers start sooner. Staff days before school run Aug. 10 to 11.
The district prints 180 instructional days across the semesters. Our count of the calendar matches.
Grading periods
Semesters
| Period | Dates | School days |
|---|---|---|
| Fall semester | Aug. 12 to Dec. 18 | 87 |
| Spring semester | Jan. 6 to May 27 | 93 |
Six-week marking periods
| Period | Dates | School days |
|---|---|---|
| 1st marking period | Aug. 12 to Sept. 18 | 27 |
| 2nd marking period | Sept. 21 to Oct. 30 | 29 |
| 3rd marking period | Nov. 2 to Dec. 18 | 31 |
| 4th marking period | Jan. 6 to Feb. 19 | 29 |
| 5th marking period | Feb. 22 to April 9 | 30 |
| 6th marking period | April 12 to May 27 | 34 |
What the district notes
- Back to School Night is Thursday, Sept. 10, and the next day (Sept. 11) is a minimum day. Open House is Thursday, March 11, and March 12 is a minimum day.
- The last three days of each semester are minimum days: Dec. 16-18 and May 25-27.
- Students return from winter recess on Wednesday, Jan. 6; Jan. 5 is a teacher workday.
Common questions
When does SMUHSD start in 2026?
The first day of school for San Mateo Union High School District is Wednesday, Aug. 12, 2026.
When is the last day of school for SMUHSD in 2027?
The last day for students is Thursday, May 27, 2027. It is an early release day.
When is winter recess for SMUHSD?
Winter recess runs Monday, Dec. 21 to Monday, Jan. 4. Counting weekends and the days next to it, students are out Saturday, Dec. 19 to Tuesday, Jan. 5 and go back Wednesday, Jan. 6.
When is spring recess for SMUHSD?
Spring recess runs Monday, March 29 to Friday, April 2. Counting weekends, students are out Saturday, March 27 to Sunday, April 4 and go back Monday, April 5.
When is Thanksgiving break for SMUHSD?
Thanksgiving break runs Wednesday, Nov. 25 to Friday, Nov. 27. Counting weekends, students are out Wednesday, Nov. 25 to Sunday, Nov. 29 and go back Monday, Nov. 30.
Does SMUHSD have early release days in 2026-27?
Yes. Friday, Sept. 11 (times vary by school), Wednesday, Dec. 16 (times vary by school), Thursday, Dec. 17 (times vary by school), Friday, Dec. 18 (times vary by school), Friday, March 12 (times vary by school), Tuesday, May 25 (times vary by school), Wednesday, May 26 (times vary by school) and Thursday, May 27 (times vary by school) are for every school.
How do I put the SMUHSD calendar on my phone?
Download one of the .ics files on this page. On an iPhone, open it and tap Add All. On Android or a computer, import it into Google Calendar or Outlook.
How we checked these dates
We read every date off the district's own calendar twice: once from the PDF's text and once from the image, cell by cell against its legend. Then we checked each one against the SMUHSD School Year Calendar page and the Spanish edition of the calendar.
Every weekday on this page matches its date. The district's printed day counts match our own count of its calendar. If the district changes its calendar, its page is the final word.
Where each date is on the district's calendar
- First day, Aug. 12: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, August grid, 12 orange; "8/12 Fall Semester begins (Students)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "12/8 Comienza el semestre de otoño (Alumnos)".
- Last day, May 27: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, May grid, 27* orange; "5/27 Spring Semester Ends (Students)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "27/5 Termina el semestre de primavera (Alumnos)".
- Professional development day (teachers start), Aug. 10: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, August grid, 10 green PD (key: PD - Professional Development Day (No School for Students)); "8/10 Fall Semester begins (Teachers)"; School Holidays "August 10 ... Professional Development Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), August grid, 10 DP.
- Teacher workshop day, Aug. 11: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, August grid, 11 marked W (key: W - Workshop/Scheduling days for all teachers). Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), August grid, 11 W.
- Labor Day, Sept. 7: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, September grid, 7 red; School Holidays "September 7 ... Labor Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), September grid, 7; "7 de septiembre ... Día del Trabajador".
- Professional development day, Oct. 12: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, October grid, 12 green PD; School Holidays "October 12 ... Professional Development Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), October grid, the Monday before 13 marked DP.
- Veterans Day, Nov. 11: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, November grid, 11 red; School Holidays "November 11 ... Veterans Day (Observance)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "11 de noviembre ... Día de los Veteranos (celebración)".
- Thanksgiving break, Nov. 25 to 27: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, November grid, 25 marked SR (key: SR - Staff Recess (No School for Students)), 26 and 27 red; "11/25 Staff Recess (No School for Students)"; School Holidays "November 26 & 27 ... Thanksgiving Days". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), November grid, 25 RP; "25/11 Receso del personal (no hay escuela para estudiantes)"; "26 y 27 de noviembre ... Días de Acción de Gracias".
- Winter recess, Dec. 21 to Jan. 4: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, December grid, 21 to 25 and 28 to 31 blue; January grid, 1 and 4 blue; "12/21-1/4/27 Winter Recess (S)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "Del 21/12 al 4/1/27 Receso de invierno (Alumnos)".
- Teacher workshop day, Jan. 5: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, January grid, 5 marked W; "1/5/2027 Fall Semester Ends (Teachers)"; School Holidays "December 21, 2026 - January 5, 2027 ... Winter Recess". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), January grid, 5 W; "5/1/2027 Termina el semestre de otoño (Docentes)".
- Martin Luther King Jr. Day, Jan. 18: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, January grid, 18 red; School Holidays "January 18 ... Martin Luther King Jr. Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "18 de enero ... Día de Martin Luther King Jr.".
- Professional development days, Jan. 25 to 26: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, January grid, 25 and 26 green PD; School Holidays "January 25 & 26 ... Professional Development Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), January grid, DP DP; "25 y 26 de enero ... Días de desarrollo profesional".
- Presidents Day, Feb. 15: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, February grid, 15 red; School Holidays "February 15 ... Presidents' Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "15 de febrero ... Día de los Presidentes".
- Spring recess, March 29 to April 2: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, March grid, 29 to 31 and April grid, 1 and 2 blue; "3/29-4/2 Spring Recess"; School Holidays "March 29 - April 2, 2027 ... Spring Recess". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "Del 29/3 al 2/4 Receso de primavera".
- Teacher workshop day, May 28: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, May grid, 28 marked W; "5/28 Spring Semester Ends (Teachers)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), May grid, 28 W.
- Memorial Day, May 31: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, School Holidays "May 31, 2027 ... Memorial Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "31 de mayo de 2027 ... Día de los Caídos".
- Minimum day, Sept. 11: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, September grid, 11*; "9/11 Minimum Day" (key: * - Minimum Day). Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "11/9 Día mínimo".
- Minimum day, Dec. 16: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, December grid, 16*; "12/16,12/17,12/18 Minimum Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "16/12, 17/12, 18/12 Día mínimo".
- Minimum day, Dec. 17: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, December grid, 17*; "12/16,12/17,12/18 Minimum Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "16/12, 17/12, 18/12 Día mínimo".
- Minimum day, end of fall semester, Dec. 18: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, December grid, 18* orange; "12/16,12/17,12/18 Minimum Day", "12/18 Fall Semester ends (Students)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "16/12, 17/12, 18/12 Día mínimo".
- Minimum day, March 12: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, March grid, 12*; "3/12 Minimum Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "12/3 Día mínimo".
- Minimum day, May 25: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, May grid, 25*; "5/25, 5/26, 5/27 Minimum Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "25/5, 26/5, 27/5 Día mínimo".
- Minimum day, May 26: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, May grid, 26*; "5/25, 5/26, 5/27 Minimum Day". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "25/5, 26/5, 27/5 Día mínimo".
- Minimum day, last day of school, May 27: San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, May grid, 27* orange; "5/25, 5/26, 5/27 Minimum Day", "5/27 Spring Semester Ends (Students)". Also: Calendario escolar 2026-2027, San Mateo Union High School District (PDF), "25/5, 26/5, 27/5 Día mínimo".
- Fall semester (semesters): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, "8/12 Fall Semester begins (Students)", "12/18 Fall Semester ends (Students)"; table "Fall Inst. Days 87".
- Spring semester (semesters): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, "1/6 Spring Semester begins(Students)", "5/27 Spring Semester Ends (Students)"; table "Spring Inst. Days 93".
- 1st marking period (six-week marking periods): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, September grid, 18 outlined; "9/18 6-week marking period".
- 2nd marking period (six-week marking periods): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, October grid, 30 outlined; "10/30 6-week marking period".
- 3rd marking period (six-week marking periods): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, December grid, 18 outlined; "12/18 6-week marking period".
- 4th marking period (six-week marking periods): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, February grid, 19 outlined; "2/19 6-week marking period".
- 5th marking period (six-week marking periods): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, April grid, 9 outlined; "4/9 6-week marking period".
- 6th marking period (six-week marking periods): San Mateo Union High School District School Calendar 2026-2027 (PDF, board approved Oct. 23, 2025), page 1, May grid, 27 ("5/27 Spring Semester Ends (Students)"); the calendar marks six-week periods ending Sept. 18, Oct. 30, Dec. 18, Feb. 19 and April 9.