Ontario High School is a high school in Ontario, California. It is one of the twelve schools in the Chaffey Joint Union High School District.
Serving 1,994 students in grades 9-12, Ontario High School ranks in the top 50% of all schools in California for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 21% (which is lower than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 60% (which is higher than the California state average of 47%).
The student-teacher ratio of 22:1 is higher than the California state level of 21:1.
Minority enrollment is 98% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 1,994 students
- Student-Teacher Ratio: 22:1
- Minority Enrollment: 98%
- Graduation Rate: 91% (Top 50% in CA)
- Overall Testing Rank: Top 50%
- Math Proficiency: 21% (Btm 50%)
- Reading Proficiency: 60% (Top 30%)
- Science Proficiency: 15% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
Top Rankings
Ontario High School ranks among the top 20% of public schools in California for:
Category
Attribute
Most improved public schools
School Overview
Ontario High School's student population of 1,994 students has declined by 14% over five school years.
The teacher population of 91 teachers has declined by 11% over five school years.
Grades Offered
Grades 9-12
Total Students
1,994 students
Total Classroom Teachers
91 teachers
Year Founded
1967
Colors
Blue and Gold
School Calendar
Campus Size
40 acres
School Rankings
Ontario High School ranks within the top 50% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Ontario High School is 0.21, which is less than the diversity score at state average of 0.63. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#4154 out of 9523 schools
(Top 50%)
(Top 50%)
Math Test Scores (% Proficient)
21%
34%
Reading/Language Arts Test Scores (% Proficient)
60%
47%
Science Test Scores (% Proficient)
15%
29%
Student-Teacher Ratio
22:1
21:1
American Indian
1%
1%
Asian
3%
12%
Hispanic
89%
56%
Black
3%
5%
White
2%
20%
Two or more races
2%
6%
All Ethnic Groups
Graduation Rate
91%
87%
Chronically Absent Students
(22-23)32.3%
27.7%
Eligible for Free Lunch
70%
54%
Eligible for Reduced Lunch
16%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Notes
- School Mascot: Jaguar
Frequently Asked Questions
What is Ontario High School's ranking?
Ontario High School is ranked #4154 out of 9,523 schools, which ranks it among the top 50% of public schools in California.
What percent of students have achieved state testing proficiency in math and reading?
21% of students have achieved math proficiency (compared to the 34% CA state average), while 60% of students have achieved reading proficiency (compared to the 47% CA state average).
What is the graduation rate of Ontario High School?
The graduation rate of Ontario High School is 91%, which is higher than the California state average of 87%.
How many students attend Ontario High School?
1,994 students attend Ontario High School.
What is the racial composition of the student body?
89% of Ontario High School students are Hispanic, 3% of students are Asian, 3% of students are Black, 2% of students are White, 2% of students are Two or more races, and 1% of students are American Indian.
What is the student-teacher ratio of Ontario High School?
Ontario High School has a student ration of 22:1, which is higher than the California state average of 21:1.
What grades does Ontario High School offer ?
Ontario High School offers enrollment in grades 9-12
What school district is Ontario High School part of?
Ontario High School is part of Chaffey Joint Union High School District.
School Reviews
Review Ontario High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
Media Literacy as a Core Skill: How to Tell if a School Teaches It Well
Learn how to evaluate whether a public school teaches media literacy effectively, from fact-checking and source evaluation to digital citizenship and critical thinking.
Screen Time, Paper Learning, and the New Back-to-Basics Debate
Explore why some public schools are reducing screen time, bringing back paper learning, and rethinking the balance between technology and traditional instruction.
Student Data, AI Tools, and Privacy: Questions to Ask Your District
Learn how public schools use AI, protect student data, and the key privacy questions every parent should ask their school district in 2026.
