Total Students89
Student/Teacher11.56:1
Math Prof.2.7%
Reading Prof.14.71%
School Information
Charter SchoolNo
Magnet SchoolNo
Virtual SchoolNo
CountySan Mateo
School DistrictJefferson Union High School District
Principal / AdminDennie Marenco(650) 550-7840
Founded1966
Free/Reduced Lunch52.81% Eligible
Acceptance Rate100%
Student Demographics
White11.2%
Hispanic61.8%
Black2.2%
Asian15.7%
Pacific Islander1.1%
Two Or More6.7%
Gender Distribution
53.9%
44.9%
Male Female
Students per Grade
Grade 92
Grade 1014
Grade 1125
Grade 1248
School Calendar 2026-2027
July 2026
Academic Schedule • 2026-2027
Holiday Event
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Thornton 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
2026-2027Discover a Vibrant Learning Community
Families often look for schools offering robust athletic programs like basketball and soccer, alongside engaging academic pursuits such as STEM and robotics. Our school aims to provide diverse avenues for student growth and exploration.
Connect and Engage with Our Campus
This institution is committed to fostering a supportive environment for all learners. Parents can review the academic calendar directly on this page for important dates and events.
Frequently Asked Questions
What types of extracurricular activities are available for students?
While specific programs vary each year, students often have access to clubs like robotics and athletics such as soccer. We recommend contacting the administration directly for the current list of activities.
How can I learn more about the school's academic programs?
Detailed information about our curriculum and academic offerings can be found throughout this website. For specific inquiries, please reach out to the school's academic department.
What is the typical class size at this high school?
Class sizes can vary by subject and grade level. The school strives to maintain manageable class sizes to facilitate effective instruction and student engagement.
Are there opportunities for students interested in the arts?
Yes, students may have opportunities to explore various art forms and creative endeavors. Specific clubs and courses related to the arts are often available.
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