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A−

Colony High

PublicHighGrades 9–12

3850 East Riverside Dr., Ontario, CA 91761 · (909) 930-2929 · Part of Chaffey Joint Union High School District

Ontario’s School Grade B− better than 51% of California school districts

Directions
Students
2,109
Students per teacher
26:1
Free or reduced lunch
70%
Setting
City
Grades
9–12
The gist

What stands out about Colony High

  • Its own letter, A−: reading and math results near the top of California’s public schools
  • Math proficiency 8 pts above the state
  • Reading / language arts 18 pts above the state
  • Larger classes: 26 students per teacher

On the path

Where Ontario kids come from and go next. The whole path →

7–89 middle schoolsDepends on your address
9–12Colony HighYou are here

Test scores

2020–21
Math proficiency42%
State average 33.6%
Reading / language arts67%
State average 48.6%

Its own letter, A−, places these results among California’s 3,615 public schools with results. Source: EDFacts via Urban Institute Education Data Portal (SY2020-21).

Location

Directions ↗

3850 East Riverside Dr., Ontario

Students

Enrollment by grade
Grade 9507
Grade 10550
Grade 11517
Grade 12535
Enrollment over time
2,162’20
2,134’21
2,122’22
2,085’23
2,109’24

About steady since 2020–21.

Who goes here
Hispanic 66%Black 13%Asian 9%White 7%Two or more races 3%Native Hawaiian/Pacific Islander <1%American Indian/Alaska Native <1%

As reported to NCES, share of students with a reported race or ethnicity.

Parents talk

Questions and answers about Colony High from Ontario families.

Other schools in Chaffey Joint Union High School District

The district →
Etiwanda High
High · Grades 9–12 · Etiwanda
A−
3,446 students25:1
Rancho Cucamonga High
High · Grades 9–12 · Rancho Cucamonga
A
3,221 students25:1
Chaffey High
High · Grades 9–12 · Ontario
B+
3,127 students23:1
Los Osos High
High · Grades 9–12 · Rancho Cucamonga
A
2,759 students26:1
Montclair High
High · Grades 9–12 · Montclair
A−
2,515 students24:1
Alta Loma High
High · Grades 9–12 · Alta Loma
A
2,386 students25:1

School facts: U.S. Department of Education (NCES), 2024–2025 school year. Test scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). A school’s letter is our own summary of its reading and math results against California’s other public schools; Ontario’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.