Guest, Sign inJoin

Post to Rancho Cucamonga

We’ll email a one-tap link to publish your post. No password, and nothing is public until you click it.
Already a member? Sign in
Los Osos High
A

Los Osos High

PublicHighGrades 9–12

6001 Milliken Ave., Rancho Cucamonga, CA 91737 · (909) 477-6900 · Part of Chaffey Joint Union High School District

Rancho Cucamonga’s School Grade A better than 88% of California school districts

Directions
Photo: Rknisely · Public domain · Wikimedia Commons
Students
2,759
Students per teacher
26:1
Free or reduced lunch
44%
Setting
Suburb
Grades
9–12
The gist

What stands out about Los Osos High

  • Its own letter, A: reading and math results near the top of California’s public schools
  • Math proficiency 30 pts above the state
  • Reading / language arts 28 pts above the state
  • Larger classes: 26 students per teacher

On the path

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

7–85 middle schoolsDepends on your address
9–12Los Osos HighYou are here

Test scores

2020–21
Math proficiency64%
State average 33.6%
Reading / language arts77%
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 ↗

6001 Milliken Ave., Rancho Cucamonga

Students

Enrollment by grade
Grade 9721
Grade 10655
Grade 11685
Grade 12698
Enrollment over time
2,954’20
2,867’21
2,837’22
2,759’23
2,759’24

Down 6.6% since 2020–21.

Who goes here
Hispanic 41%White 24%Asian 23%Black 6%Two or more races 5%American Indian/Alaska Native <1%Native Hawaiian/Pacific Islander <1%

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

Parents talk

Questions and answers about Los Osos High from Rancho Cucamonga 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
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
Colony High
High · Grades 9–12 · Ontario
A−
2,109 students26:1

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; Rancho Cucamonga’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.