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Peninsula High School
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San Mateo Union High School District
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School Calendar 2026-2027
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Fall 2026Spring 2027
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AugustMTWThFJanuaryMTWThFMinimum Days
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8/10 Professional Development Day (Teachers)1August 12
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8/12 Trimester 1 Begins (Students)PDW12*13141/6 School Resumes (Students)4W678September 11
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Professional Development Day 17181920211/20 - Minimum Day1112131415September 16
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8/12 - Minimum Day24252627281/18 - Martin Luther King Jr. Holiday181920*2122September 23
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311/25-26 Professional Development Day PDPD272829October 21
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November 6
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SeptemberMTWThFFebruaryMTWThFNovember 9
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9/07 Labor Day Holiday123412345November 18
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9/10 Back to School NightH891011*2/17, 2/26 Minimum Day89101112December 18
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9/11,9/16,9/23 Minimum day141516*17182/15 President's Day HolidayH1617*1819January 20
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9/18 6-week marking period212223*24252/26 Trimester 2 Ends2223242526*February 17
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282930February 26
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March 1
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OctoberMTWThFMarchMTWThFMarch 12
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123/1 Trimester 3 Begins1*2345March 24
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5678989101112*April 14
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10/12 Professional Development Day PD131415163/11 Open House1516171819April 21
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10/21 Minimum Day192021*22233/1, 3/12, 3/24 Minimum Day222324*2526May 26
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3/29 - 4/2 Spring Recess293031May 27
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NovemberMTWThFAprilMTWThF
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 Trimester 1 Ends 11/623456*3/29 - 4/2 Spring Recess12
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 Trimester 2 Begins 11/099*101112134/9 6-week marking period56789
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11/11 Veteran's Day Holday161718*19204/14,4/21 Minimum day121314*1516
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11/25 Staff Recess(No School for Students)2324SR2627192021*2223
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11/26 - 11/27 - Thanksgiving Holiday302627282930
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DecemberMTWThFMayMTWThF
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12/18 6-week marking period789101134567
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12/18 Minimum Day1415161718*5/26-27 Minimum Days1011121314
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12/21/26 - 1/4/27 Winter Recess21222324255/27 Trimester 3 Ends (Students)1718192021
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282930315/28 Trimester 3 Ends (Teachers)242526*27*28
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Key:
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* - Purple - Minimum DayTrimester Dates
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W - Workshop/Scheduling days for all teachersTrimester 1: August 12 - November 6
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PD - Professional Development Day (No School for Students)Trimester 2: November 9 - February 26
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SR - Staff Recess (No School for Students)Trimester 3: March 1 - May 27
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Inst. DaysPD DaysWorkdaysTotal Contract Days
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Fall872291
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Spring932196
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Total Days18043187
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School Holidays
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August 10……………...……Professional Development Day
January 18…………………...……...………Martin Luther King Jr. Day
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September 7……………….……..…………….……Labor Day
January 25 & 26……………...…....….Professional Development Day
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October 12…………………..Professional Development Day
February 15……………………...…….…….………….Presidents' Day
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November 11………………...…..Veterans Day (Observance)
March 29 - April 2, 2027 ….…………….……………….Spring Recess
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November 26 & 27.....................................Thanksgiving Days
May 31, 2027………...……………...…..…...……………Memorial Day
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December 21, 2026 - January 5, 2027.…..…Winter Recess
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Adopted by the Board of Trustees - Board Approved 10.23.25
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