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Los Osos High School

Public School | Grades 9-12 | Chaffey Joint Union High
6001 Milliken Ave
Rancho Cucamonga, CA 91737
(909) 477-6900

About This School

Los Osos High School is located in Rancho Cucamonga, CA and is one of 11 high schools in Chaffey Joint Union High School District. It is a public school that serves 3365 students in grades 9-12. See Los Osos High School's test results to learn more about school performance.

A school's Academic Performance Index (API) is a scale that ranges from 200 to 1000 and is calculated from the school's performance in the Standardized Testing and Reporting (STAR) Program. The state has set 800 as the API target for all schools to meet.

Los Osos High School had an API growth score of 849 in 2012. California uses the Academic Performance Index (API) to measure annual school performance and year-to-year improvement. Los Osos High School's 2012 base score was 837 and the school did meet its 2012 school-wide growth target.

In 2010, Los Osos High School had 28 students for every full-time equivalent teacher. The California average is 24 students per full-time equivalent teacher.

Student Ethnicity (2011)

Students (2011)


Students Per Teacher (2010)

Female/Male (2011)

49% 51%

Subsidized Lunch (2011)


District Spending (2010)

per student
See All Test Scores

All Grades Geometry Performance

CST Results
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Los Osos High School Reviews

Proud to be a Grizzly

By , a Former Student on

I attended all four years here and I can honestly say it was the greatest experience of my life. I just recently graduated on May 22, 2014. You're surrounded around great students, teachers and counselors are always their to help you through anything necessary, and the school itself is incredible with how interactive it is with the students with all kinds of different clubs and sports. So proud to be a GRIZZLY!!

By a Current Student on

This school is the best. It has great people who are willing to help when you need help. If you have questions all you have to do is ask. The teachers are great and they are understanding and will give their all to help you out. I concider people to go to Los Osos High School because it is a great school and your years here will be great! Come and be a part of the GRRR!!! family :)

By a Current Student on

i like osos friendly atmosphere and great teachers!!!

By , a Parent on

My four children went to LOHS and I am extremely satisfied with the education they received!
All of them are actice members of society and three of them are college students, and a senior at LOHS for next year.
I was the Recording Secretary for the Band Boosters for five years, and my husband the VP for ways and means for the Crosscountry and Track boosters.

Los Osos High School Photos

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