Total Students1,994
Student/Teacher21.85:1
Math Prof.29.55%
Reading Prof.62.55%
Graduation Rate94.5%
School Information
Charter SchoolNo
Magnet SchoolNo
Virtual SchoolNo
CountySan Bernardino
School DistrictChaffey Joint Union High School District
Principal / AdminLarry Rook(909) 988-7411
Founded1980
Free/Reduced Lunch86.66% Eligible
Acceptance Rate100%
Student Demographics
White2.4%
Hispanic88.9%
Black2.7%
Asian3.3%
Native American0.8%
Pacific Islander0.4%
Two Or More1.5%
Gender Distribution
52.1%
47.9%
Male Female
Students per Grade
Grade 9507
Grade 10507
Grade 11528
Grade 12452
School Calendar 2026-2027
July 2026
Academic Schedule • 2026-2027
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Ontario 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 HolidayJul 3
First Day of School for StudentsAug 5
Labor Day HolidaySep 7
First Quarter EndsOct 2
Floating HolidayOct 5
Veterans Day ObservanceNov 11
Thanksgiving RecessNov 23
Second Quarter and First Semester EndDec 17
Winter Recess BeginsDec 21
New Year's Day HolidayJan 1
Martin Luther King Jr. Day ObservanceJan 18
Abraham Lincoln's Day HolidayFeb 8
Presidents Day ObservanceFeb 15
Third Quarter EndsMar 5
Spring Break BeginsMar 29
Spring Break EndsApr 1
Fourth Quarter and Second Semester EndMay 20
Memorial Day HolidayMay 31
Juneteenth HolidayJun 18
Key Dates & Holidays
2026-2027Community Reviews
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