Chaffey Joint Union High School District

211 West Fifth St.
Ontario, CA 91762-1698
(District boundaries shown in map)
8/
10
Top 30%

Top Rankings

Chaffey Joint Union High School District ranks among the top 20% of public school district in California for:

Category
Attribute
Reading/Language Arts Proficiency
Highest reading/language arts proficiency (Top 20%)
Community Size
Largest student body (number of students) (Top 1%)
For the 2026 school year, there are 11 public high schools serving 22,539 students in Chaffey Joint Union High School District. This district's average high testing ranking is 9/10, which is in the top 20% of public high schools in California.
Public High Schools in Chaffey Joint Union High School District have an average math proficiency score of 34% (versus the California public high school average of 28%), and reading proficiency score of 66% (versus the 51% statewide average).
Public High School in Chaffey Joint Union High School District have a Graduation Rate of 90%, which is more than the California average of 86%.
The school with highest graduation rate is Los Osos High School, with 95% graduation rate. Read more about public school graduation rate statistics in California or national school graduation rate statistics.
Minority enrollment is 87% of the student body (majority Hispanic), which is more than the California public high school average of 79% (majority Hispanic).

Overview

This School District
This State (CA)
# Schools
11 Schools
2,813 Schools
# Students
22,539 Students
2,140,343 Students
# Teachers
938 Teachers
100,763 Teachers
Student-Teacher Ratio
24:1
24:1

Student By Grade

District Rank

Chaffey Joint Union High School District, which is ranked #469 of all 1,908 school districts in California (based off of combined math and reading proficiency testing data) for the 2022-2023 school year.
The school district's graduation rate of 90% has increased from 89% over five school years.
This School District
State Average (CA)
#429 out of 1932 school districts
(Top 30%)
35%
34%
66%
47%
26%
29%
90%
87%

Students by Ethnicity:

0.55
0.63
% American Indian
n/a
1%
% Asian
10%
11%
% Hispanic
65%
56%
% Black
8%
5%
% White
13%
22%
% Hawaiian
n/a
n/a
% Two or more races
4%
5%
All Ethnic Groups

District Revenue and Spending

The revenue/student of $20,960 is higher than the state median of $19,974. The school district revenue/student has grown by 32% over four school years.
The school district's spending/student of $17,424 is less than the state median of $18,395. The school district spending/student has stayed relatively flat over four school years.
This School District
This State (CA)
Total Revenue
$472 MM
$116,387 MM
Spending
$393 MM
$107,188 MM
Revenue / Student
$20,960
$19,974
Spending / Student
$17,424
$18,395

Best Chaffey Joint Union High School District Public High Schools (2026)

School
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Los Osos High School
(Math: 51% | Reading: 81%)
Rank:
9/
10
Top 20%
6001 Milliken Ave.
Rancho Cucamonga, CA 91737
(909) 477-6900
Gr: 9-12 | 2,759 students Student-teacher ratio: 25:1 Minority enrollment: 73%
Rank: #22.
Etiwanda High School
(Math: 43% | Reading: 75%)
Rank:
9/
10
Top 20%
13500 Victoria St.
Rancho Cucamonga, CA 91739
(909) 899-2531
Gr: 9-12 | 3,540 students Student-teacher ratio: 25:1 Minority enrollment: 85%
Rank: #33.
Alta Loma High School
(Math: 42% | Reading: 75%)
Rank:
9/
10
Top 20%
8880 Baseline Rd.
Rancho Cucamonga, CA 91701
(909) 989-5511
Gr: 9-12 | 2,400 students Student-teacher ratio: 24:1 Minority enrollment: 76%
Rank: #44.
Rancho Cucamonga High School
(Math: 41% | Reading: 74%)
Rank:
9/
10
Top 20%
11801 Lark Dr.
Rancho Cucamonga, CA 91701
(909) 989-1600
Gr: 9-12 | 3,343 students Student-teacher ratio: 26:1 Minority enrollment: 79%
Rank: #55.
Chaffey District Online High School
Alternative School
(Math: ≥50% | Reading: ≥50%)
Rank:
8/
10
Top 30%
1802 East 7th St.
Ontario, CA 91764
(909) 985-0966
Gr: 9-12 | 112 students Student-teacher ratio: 22:1 Minority enrollment: 74%
Rank: #66.
Montclair High School
(Math: 31% | Reading: 62%)
Rank:
7/
10
Top 50%
4725 Benito St.
Montclair, CA 91763
(909) 621-6781
Gr: 9-12 | 2,605 students Student-teacher ratio: 24:1 Minority enrollment: 96%
Rank: #77.
Chaffey Community Day
Alternative School
(Math: <50% | Reading: <50% )
Rank:
7/
10
Top 50%
1802 East Seventh St.
Ontario, CA 91764
(909) 985-0966
Gr: 9-12 | 16 students Student-teacher ratio: 8:1 Minority enrollment: 94%
Rank: #88.
Colony High School
(Math: 25% | Reading: 62%)
Rank:
7/
10
Top 50%
3850 East Riverside Dr.
Ontario, CA 91761
(909) 930-2929
Gr: 9-12 | 2,085 students Student-teacher ratio: 24:1 Minority enrollment: 93%
Rank: #99.
Ontario High School
(Math: 21% | Reading: 60%)
Rank:
6/
10
Top 50%
901 West Francis St.
Ontario, CA 91762
(909) 988-7411
Gr: 9-12 | 2,121 students Student-teacher ratio: 22:1 Minority enrollment: 97%
Rank: #1010.
Chaffey High School
(Math: 18% | Reading: 54%)
Rank:
5/
10
Bottom 50%
1245 North Euclid Ave.
Ontario, CA 91762
(909) 988-5560
Gr: 9-12 | 3,223 students Student-teacher ratio: 24:1 Minority enrollment: 96%
Rank: #1111.
Valley View High (Continuation School)
Alternative School
(Math: ≤5% | Reading: 6-9%)
Rank:
1/
10
Bottom 50%
1801 East Sixth St.
Ontario, CA 91764
(909) 985-0966
Gr: 9-12 | 335 students Student-teacher ratio: 13:1 Minority enrollment: 94%

Recent Articles

Year-Round Schooling in 2026: Updated Parent Guide
Year-Round Schooling in 2026: Updated Parent Guide
Explore the latest 2026 data, trends, costs, and parent planning tips in the ongoing debate over year-round schooling vs the traditional calendar.
No Child Left Behind: Past, Present, and Future of U.S. School Policy
No Child Left Behind: Past, Present, and Future of U.S. School Policy
Explore how No Child Left Behind evolved into ESSA, what it means for 2025‑26 schooling, and what parents need to know about testing, admissions planning, and funding.
Understanding Public School Fees & Optional Costs Guide
Understanding Public School Fees & Optional Costs Guide
Discover what public school fees are required versus optional, with 2026 updates for parents, students, and educators on budgeting and planning.

Quick Facts (2026)

  • District size: 11 schools
  • Grades: 09-12
  • Enrollment: 22,539 students
  • Student-Teacher Ratio: 24:1
  • Minority Enrollment: 87%
  • : 90% (Top 30% in CA)
  • : Top 30%
  • : 35% (Top 50%)
  • : 66% (Top 20%)
  • : 26% (Top 50%)
  • Source: National Center for Education Statistics (NCES), CA Dept. of Education

Quick Links