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 2,121 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 22% (which is lower than the California state average of 33%). 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 97% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Stats (2025)
- Grades: 9-12
- Enrollment: 2,121 students
- Student:Teacher Ratio: 22:1
- Minority Enrollment: 97%
- Graduation Rate: 93% (Top 30% in CA)
- Overall Testing Rank: Top 50%
- Math Proficiency: 22% (Btm 50%)
- Reading Proficiency: 60% (Top 30%)
- Science Proficiency: 15% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Overview
Ontario High School's student population of 2,121 students has declined by 12% over five school years.
The teacher population of 96 teachers has declined by 6% over five school years.
Grades Offered
Grades 9-12
Total Students
2,121 students
Gender %
Total Classroom Teachers
96 teachers
Year Founded
1967
School Rankings
Ontario High School ranks within the top 50% of all 9,602 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
#3898 out of 9602 schools
(Top 50%)
(Top 50%)
Math Test Scores (% Proficient)
22%
33%
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
2%
5%
White
3%
20%
Hawaiian
n/a
n/a
Two or more races
2%
6%
All Ethnic Groups
Graduation Rate
93%
87%
Eligible for Free Lunch
75%
54%
Eligible for Reduced Lunch
12%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
Profile last updated: 02/09/2025
Frequently Asked Questions
What is Ontario High School's ranking?
Ontario High School is ranked #3898 out of 9,602 schools, which ranks it among the top 50% of public schools in California.
What schools are Ontario High School often compared to?
Ontario High Schoolis often viewed alongside schools like Chaffey High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
22% of students have achieved math proficiency (compared to the 33% 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 93%, which is higher than the California state average of 87%.
How many students attend Ontario High School?
2,121 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 White, 2% of students are Black, 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 Calendar
View the Ontario High School yearly calendar below.
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
Parents’ Guide to Special Education
Special education law is not easy to decipher, with several regulations that govern special education services for disabled students. In this article, learn about the core components of the laws, rights, and individual education plans that can help create the best public school environment for your child.
Surveillance Cameras: Violation of Rights or Improved Security?
A school district in Virginia has given the green light to schools that want to install surveillance cameras in common areas like cafeterias and hallways. We’ll look at whether this is a violation of student privacy or the best way to keep order in schools.
Teachers in 19 States Allowed to Physically Punish Students
As of 2014, nineteen states still allow corporal punishment – spanking and paddling the most common choices – in their public schools. However, some argue that not only are these punishments physically harmful, they also are disproportionately administered to students of color. As a result, House democrats have taken up the issue in a new bill that would ban all forms of corporal punishment nationwide.
