Colony High School is a high school located in Ontario, California, and is part of the Chaffey Joint Union High School District. The school serves the communities of southern Ontario, including the new Ontario Ranch community and portions of eastern Rancho Cucamonga and southeast Fontana.
Serving 2,109 students in grades 9-12, Colony 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 25% (which is lower than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 62% (which is higher than the California state average of 47%).
The student-teacher ratio of 26:1 is higher than the California state level of 21:1.
Minority enrollment is 93% 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: 2,109 students
- Student-Teacher Ratio: 26:1
- Minority Enrollment: 93%
- Graduation Rate: 92% (Top 30% in CA)
- Overall Testing Rank: Top 50%
- Math Proficiency: 25% (Btm 50%)
- Reading Proficiency: 62% (Top 30%)
- Science Proficiency: 22% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
Top Rankings
Colony High School ranks among the top 20% of public schools in California for:
Category
Attribute
Most improved public schools
School Overview
Colony High School's student population of 2,109 students has stayed relatively flat over five school years.
The teacher population of 81 teachers has declined by 10% over five school years.
Grades Offered
Grades 9-12
Total Students
2,109 students
Total Classroom Teachers
81 teachers
Year Founded
2002
Colors
White, Blue, Red
School Calendar
School Motto
To provide student learning, and ultimately their achievement.
School Rankings
Colony 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 Colony High School is 0.53, 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
#3536 out of 9523 schools
(Top 50%)
(Top 50%)
Math Test Scores (% Proficient)
25%
34%
Reading/Language Arts Test Scores (% Proficient)
62%
47%
Science Test Scores (% Proficient)
22%
29%
Student-Teacher Ratio
26:1
21:1
American Indian
n/a
1%
Asian
9%
12%
Hispanic
67%
56%
Black
13%
5%
White
7%
20%
Hawaiian
1%
n/a
Two or more races
3%
6%
All Ethnic Groups
Graduation Rate
92%
87%
Eligible for Free Lunch
53%
54%
Eligible for Reduced Lunch
17%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Notes
- School Mascot: Tommy The Titan
Frequently Asked Questions
What is Colony High School's ranking?
Colony High School is ranked #3536 out of 9,523 schools, which ranks it among the top 50% of public schools in California.
What schools are Colony High School often compared to?
Colony High Schoolis often viewed alongside schools like Chaffey High School, Wilmer Amina Carter High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
25% of students have achieved math proficiency (compared to the 34% CA state average), while 62% of students have achieved reading proficiency (compared to the 47% CA state average).
What is the graduation rate of Colony High School?
The graduation rate of Colony High School is 92%, which is higher than the California state average of 87%.
How many students attend Colony High School?
2,109 students attend Colony High School.
What is the racial composition of the student body?
67% of Colony High School students are Hispanic, 13% of students are Black, 9% of students are Asian, 7% of students are White, 3% of students are Two or more races, and 1% of students are Hawaiian.
What is the student-teacher ratio of Colony High School?
Colony High School has a student ration of 26:1, which is higher than the California state average of 21:1.
What grades does Colony High School offer ?
Colony High School offers enrollment in grades 9-12
What school district is Colony High School part of?
Colony High School is part of Chaffey Joint Union High School District.
In what neighborhood is Colony High School located?
Colony High School is located in the Ontario Ranch neighborhood of Ontario, CA.
School Reviews
5 10/10/2025
Excellent school. Students well-involved in sports, and love to show school spirit(:
Review Colony 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
AI Report Cards: Should Schools Evaluate AI Use?
Explore whether schools should assess student AI use, the benefits, risks, and what responsible AI report cards could look like in 2026.
The Parent’s Guide to School Cell Phone Bans in 2026
Learn how school cell phone bans work in 2026, why districts are adopting them, and what parents should expect.
Parental Involvement in Public Schools: 2026 Update
Explore the latest 2026 trends, research, and strategies shaping parental involvement in public schools and student success.
