Los Osos High


Student Enrollment
Best High School in California
 Rating 8 out of 10
Grades 9 to 12th grade
School District Chaffey Joint Union High
Type Public
 Phone (909)477-6900
 Location 6001 Milliken Ave.
Rancho Cucamonga, CA 91737
Charter School No

Los Osos High has an academic rating well above the average for California high schools based on its high test performance and high AP course participation. It is ranked 128th in the best public high schools in California.



The Los Osos High student body is predominantly White with a significant Hispanic population and has very high racial diversity.

Race Percent Students
Asian Pacific15.3%490
Native American Indian0.4%14
Hawaiian Pacific Inlander0.6%18
Two or more races1.6%50

Family Income

vs. other California high schools
Upper 15.5%

18.1% percent of the school's students are eligible for free lunch under the National School Lunch Program compared to the California high school median of 48.5%. By this measure, Los Osos High students are largely upper income and rank 197th in California for high school student family income.

Enrollment by Grade

Grade Students


State Standardized Test Performance

8 out of 10

Rank: 175th in California

Students at Los Osos High scored an average 62% of students proficient for math and reading as tested by the California Department of Education. Performance is well above the state high school median of 42% proficiency and places the school's test performance in the top 14.9% of California high schools.

Test Proficiency By Gender

Gender Math Proficient Reading Proficient

State Test Proficiency by Subgroup

Subgroup Math Proficient Reading Proficient
American Indiansuppressed*suppressed*
Asian & Pacific Islander80% to 84%*80% to 84%*
Black35% to 39%*65% to 69%*
Hispanic40% to 44%*60% to 64%*
Multiracial50% or more*50% or more*
White50% to 54%*75% to 79%*
With Disabilites10% or less*20% to 29%*
Limited Englishless than 50%*less than 50%*

*Indicates statistic has been anonymized to protect student privacy.

College Admission Test Scoring

Average SAT Score

The average SAT score for Los Osos High students in 2016 was 1131.

College Admission Test Participation

8 out of 10

Rank: 193rd in California

705 out of 1,590 junior and senior of students took either the ACT or SAT test (44%). College admission testing participation is well above the California median rate of 29% and in the top 21% for participation.

AP Course and Test Performance

6 out of 10

Rank: 296th in California

Los Osos High offers 22 AP courses. 29 percent of grade nine through twelve students are enrolled in at least one AP class. The AP participation rate is in the 76% percentile and well above the median AP enrollment rate for all California schools of 21%. Los Osos High had 501 taking AP exams with a 334 passing at least one exam. The AP pass rate is in the 67% percentile and somewhat above the state median of 55 percent.

School State
AP Test Pass Rate 67% 55%
Students enrolled in an AP class 29% 21%
AP Math Enrollment Rate 5%
AP Science Enrollment Rate 8%
AP Other Enrollment Rate 28%
AP Courses Offered 22

Learning Environment

Absenteeism Rate

School State
Overall Chronic Absenteeism Rate9%14%
Female Chronic Absenteeism Rate10%
Male Chronic Absenteeism Rate8%

Safety and Discipline

Police Referral Rate

Group Percent Referrals
All Students2.1%65
California Median0%

Police Arrest Rate

Group Percent Arrests
All Students0.1%4

Expulsion Rate

Group Percent Expulsions
All Students0.3%9
California Median0%

In-School Suspension Rate

Group Percent Suspensions
All Students0%0
California Median0.3%

Out-of-School Suspension Rate

Group Percent Suspensions
All Students0%0


Los Osos High
6001 Milliken Ave.
Rancho Cucamonga, CA

9 out of 10 1


Chaffey Joint Union High
Ontario, CA