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Chapter

Los Osos High

Rancho Cucamonga, CA
PublicHigh · Grades 9–12
cjuhsd.net6001 Milliken Ave., Rancho Cucamonga, CA 91737(909) 477-6900
Test scores
California state tests, 2024–25

English language arts

624 students tested

79.0% met or exceeded the standard. In 2023–24, 81.8% did.

  • Exceeded50.8%
  • Met28.2%
  • Nearly met13.6%
  • Not met7.4%

Math

621 students tested

50.9% met or exceeded the standard. In 2023–24, 48.6% did.

  • Exceeded28.2%
  • Met22.7%
  • Nearly met22.9%
  • Not met26.3%
Discipline
State and federal reports

California Department of Education

3.4% of students were suspended at least once in 2024–25.

Measure2023–242024–25
Enrolled during the year2,8942,894
Suspended in or out of school2.1% · 623.4% · 99
Suspensions68127
Violence with injury1737
Violence without injury2353
Weapons22
Drugs2234
Defiance only30
Other11

Each suspension is listed under its most serious offense.

U.S. Department of Education

Measure2021–222023–24
Enrolled in the fall2,8642,742
Suspended out of school3.2% · 932.2% · 61
Suspended in school0.2% · 60.1% · 3
Expelled0.1% · 40.1% · 3
Attendance
California Department of Education

25.0% of students were chronically absent in 2024–25.

Measure2023–242024–25
Students counted2,8132,807
Chronically absent16.0% · 45025.0% · 703

Chronically absent means missing 10% or more of the school days a student was enrolled.

School Profile

Location

Suburb, Large

Enrollment

2,759 students

Student-Teacher Ratio

25:1

Demographics
Hispanic/Latino40.7%
x
White27.1%
x
Black or African American6.0%
x
Asian22.0%
x
Two or More Races3.7%
x
American Indian or Alaska Native0.3%
x
Native Hawaiian or Pacific Islander0.2%
x
Public school directory

NCES ID 060816010605

District
Chaffey Joint Union High
Status
Open
School category
Regular School
Charter
No
Virtual instruction
Supplemental virtual
Enrollment
2,759 students
Teachers (FTE)
110.8

Sources