Total Students1,072
Student/Teacher19.49:1
Math Prof.20.21%
Reading Prof.46.5%
Graduation Rate94.8%
School Information
Charter SchoolNo
Magnet SchoolNo
Virtual SchoolNo
CountySan Mateo
School DistrictJefferson Union High School District
Principal / AdminJohn Harrigan(650) 550-7700
Founded1922
Free/Reduced Lunch41.14% Eligible
Acceptance Rate100%
Student Demographics
White3.8%
Hispanic50.7%
Black2.1%
Asian37.5%
Pacific Islander1.6%
Two Or More3.7%
Gender Distribution
53.4%
46.2%
Male Female
Students per Grade
Grade 9257
Grade 10258
Grade 11297
Grade 12260
School Calendar 2026-2027
July 2026
Academic Schedule • 2026-2027
Holiday Event
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Jefferson High School
Academic Calendar (2026-2027)
July 2026
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August 2026
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September 2026
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October 2026
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November 2026
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December 2026
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January 2027
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February 2027
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March 2027
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April 2027
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May 2027
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June 2027
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Key Dates & Holidays
Independence Day Observation HolidayJul 3
First Day of SchoolAug 6
Fall Semester First Grading Period BeginsAug 6
Labor Day HolidaySep 7
Fall Semester First Grading Period EndsSep 18
Fall Semester Second Grading Period BeginsSep 21
Indigenous Peoples Day HolidayOct 12
Fall Semester Second Grading Period EndsOct 30
Fall Semester Third Grading Period BeginsNov 2
Veterans Day HolidayNov 11
Thanksgiving RecessNov 23
Fall Semester Third Grading Period EndsDec 18
Winter RecessDec 21
Spring Semester First Grading Period BeginsJan 4
Martin Luther King Jr. Day HolidayJan 18
Lunar New Year Observation HolidayFeb 8
President's Week RecessFeb 15
Spring Semester First Grading Period EndsFeb 26
Spring Semester Second Grading Period BeginsMar 1
Spring BreakApr 5
Spring Semester Second Grading Period EndsApr 16
Spring Semester Third Grading Period BeginsApr 19
Last Day of SchoolMay 28
Spring Semester Third Grading Period EndsMay 28
Memorial Day HolidayMay 31
Extended School Year (ESY)Jun 1
Juneteenth Observation HolidayJun 18
Key Dates & Holidays
2026-2027Community Reviews
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