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 2,085 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 24:1 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: 2,085 students
- Student-Teacher Ratio: 24:1
- 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
<麻豆果冻传媒 class="so-dt-title" id="top-rankings">Top Rankings
Colony High School ranks among the top 20% of public schools in California for:
Category
Attribute
Most improved public schools
<麻豆果冻传媒 class='so-dt-title' id="overview">School Overview <麻豆果冻传媒 class='so-dt-title' id="school-rankings">School Rankings
Colony High School's student population of 2,085 students has stayed relatively flat over five school years.
The teacher population of 87 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
Total Students
2,085 students
Gender %
Total Classroom Teachers
87 teachers
Year Founded
2002
Colors
White, Blue, Red
School Calendar
Last Day of School
Mon. May 25, 2026
School Motto
To provide student learning, and ultimately their achievement.
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 0.51, 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
24:1
21:1
American Indian
n/a
1%
Asian
9%
12%
Hispanic
68%
56%
Black
12%
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
58%
54%
Eligible for Reduced Lunch
14%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
<麻豆果冻传媒 class='so-dt-title' id="school-notes">School Notes- School Mascot: Tommy The Titan
Profile last updated: 02/09/2025
<麻豆果冻传媒 class='so-dt-title' id='faq'>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?
2,085 students attend Colony High School.
What is the racial composition of the student body?
68% of Colony High School students are Hispanic, 12% 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 24:1, 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. There are 1 other public schools located in Ontario Ranch.
School Reviews5 10/10/2025Excellent 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
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
麻豆果冻传媒 Articles
Back-to-School Tech & Online Learning Readiness Checklist
A 2026 guide to back-to-school tech & online learning readiness, helping families prepare devices, connectivity, skills, and safety.
How Public Schools Prepare for College in High School
Learn how public schools prepare for college and what parents should look for as students begin high school. Updated for 2026.
School Choice in 2026: What Parents Must Know
Explore how school choice is reshaping U.S. education in 2026, with updated trends, enrollment data, costs, policies, and practical guidance for parents.
