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Vision: All CJUHSD students will graduate ready for college and careers.

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Los Osos High School
24 Hour Attendance Line

(909) 460-5860

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Hey LOHS....


The Chaffey Joint Union High School District has partnered with School Loop. School Loop is an innovative communication tool designed to keep parents, students, teachers and staff connected. With School Loop parents and students can:

  •  Check assignments online
  •  Monitor current grades
  •  Email teachers/counselors
  •  View school news/events
  •  Submit work electronically

Every Chaffey District parent and student is encouraged to register. It takes less than two minutes to sign up and all accounts are FREE! Click the 'Register Now' tab on the top left of this page.   


Apply Online for Meal Benefits

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Try a new and convenient way to apply for Free and Reduced Meal Benefits online. It's fast, easy and confidential. 


Patriot Day Activity

Patriot Day Activity

Volunteer Opportunity

The City of Rancho Cucamonga is looking for
Volunteer Volleyball Coaches
for Youth League
(Experience is NOT required)


Volunteer Flyer
Youth Volleyball Flyer


Back to School

Back to School
Monday, August 8, 2016

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Complete Summer Mailer Online!


The Chaffey Joint Union High School District is now offering the option of completing the summer mailer online for returning students. If interested, please complete and return the Online Authorization Form to Los Osos High School to get your Aeries Parent Portal account.

Online Authorization Form: English, Spanish

Login to Aeries Parent Portal


Dear Grizzly Family,

We are beyond excited for the upcoming school year and I am humbled and honored to be the new Principal at Los Osos High School. This year we will be celebrating 15 years of Grizzly excellence. During this time, Los Osos has enjoyed much success in academics, athletics, arts and activities. Understanding our vison, all students will graduate ready for college and careers, drives our staff to continually focus on providing effective classroom instruction and increasing student achievement. In addition, we will continue to work hard to provide all students with a safe and equitable school environment to foster their individual growth.

Parents, you play an equally important role in the success of both your student and our school. We encourage you to emphasize the importance of student learning and daily attendance with your child, communicate often with our teachers who are here to support all of our Grizzlies and regularly monitor grades and academic progress through School Loop.  We believe in WE>I, meaning working together we will accomplish so much more than working as individuals. These are key ingredients to a successful school.

I am extremely excited for the 2016-17 school year and we look forward to seeing all of our Grizzlies back on Monday, August 8th for the first day of school. 


Claws up!

Mr. Joshua Kirk


The school year will be here before you know it and below are important dates to remember.

Schedule Pick-Up

Tues., July 26th SENIORS 12:30-3:30
  Schedule Pick-up in Cafeteria Lines  
  (No counselors available)  
Wed., July 27th JUNIORS 8:00-11:00
  Schedule Pick-up in Cafeteria Lines  
  (No counselors available)  
Wed., July 27th SOPHOMORES 12:30-3:30
  Schedule Pick-up in Cafeteria Lines  
  (No counselors available)  
Thurs., July 28th FRESHMAN ORIENTATION A-L 8:00-11:00
  Meet in Theater  
  (No counselors available)  
Thurs., July 28th FRESHMAN ORIENTATION M-Z 12:00-3:00
  Meet in Theater  
  (No counselors available)  
Fri., July 29th MAKE-UPS 9:00-12:00
  Schedule Pick-up in Guidance Office  
  (No counselors available)  
Mon., August 1st SENIOR Schedule Needs 1:00-2:30
Tues., August 2nd JUNIOR Schedule Needs 8:00-9:30
Tues., August 2nd SOPHOMORE Schedule Needs 1:00-2:30
Wed., August 3rd FRESHMAN Schedule Needs 8:00-9:30


Senior Pictures

Seniors, Lifetouch will be sending out information in the mail regarding senior pictures.  You will need to contact Lifetouch and schedule a time to come take your pictures in the theater foyer.  Your senior picture for the yearbook is free of charge, however, if you would like to purchase additional photos, you will have the opportunity to do so.  Below are the dates you will be able to schedule your pictures. 

Seniors Picture Dates (8am – 4pm)

  • July 6-8, 11-15, 18-22
  • Sept 28-30

Life Touch - (909) 204-4126  

Week at a Glance


Perfect Attendance New Car Give Away

Mark Christopher Chevrolet
It's Cool to Stay in School
New Car Give Away


Get perfect attendance at Los Osos High School during the 2016-17 school year and you will be eligible to win a new car from Mark Christopher Chevrolet!


Official Rules


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Am I Ready for the Future?

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Los Osos High School - A California Distinguished School

CA Distinguished School Logo

Dear Distinguished School Award Recipient,

Congratulations on successfully completing the 2013 California Distinguished School application process, and being recognized as one of our 218 California Middle and High Distinguished Schools! This award is a direct reflection of the dedication, hard work, and vision of your school’s educational community, and I am pleased to be able to award this honor to your school.

This year we will be recognizing the 2013 Distinguished Middle and High Schools along with the Exemplary Program Honors, the 2012 National Blue Ribbon Schools, and the 2013 Title I Academic Achievement Award Schools.

The news release identifying all the 2013 Distinguished Middle and High Schools is posted online at http://www.cde.ca.gov/ under What’s New.

Again, congratulations on receiving Distinguished School recognition. Please note that if you also applied for Exemplary Program honors, it will be announced very soon through a separate news release. If you have any questions regarding this subject, contact the Awards Team at 916-319-0842 or by e-mail at Awards@cde.ca.gov.


Tom Torlakson

The Chaffey Joint Union High School District does not discriminate on the basis of sex, sexual orientation, gender, ethnic group identification, race, ancestry, national origin, religion, color, mental disability, physical disability, age or any other bias protected by law in its education programs or activities or in personnel or employment practices.

Concerns should be addressed to the following District Administrators, or by visiting the listed District Administrator at 211 W. Fifth St., Ontario, CA or by calling the District Office at (909) 988-8511:

Personnel and Employment Practices  
Discipline, Suspensions, Expulsions  
     Lynne Ditfurth, Deputy Superintendent Ext. 2660
Educational Programs  
     Tim Ward, Assistant Superintendent Ext. 2700
     Rick Wiersma, Assistant Superintendent Ext. 2680
Title IX - Report of Sexual Harassment  
(ensures sex equity in all district operations)  
     Lynne Ditfurth, Deputy Superintendent Ext. 2660
Section 504  
(protects the rights of pupils with disabilities)  
    Kelly Whelan, Special Education Director Ext. 2610

Mr. Kirk, Principal

Joshua Kirk, Principal

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LOHS Summer Assignments

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Los Osos News

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School Accountability Report Card

2014-2015 - English
2014-2015 - Spanish

A hard copy of our SARC Report is available in the main office.

Register to Vote

Click the image above to register to vote.

The Common Core State Standards Overview

"We are what we repeatedly do.  Excellence, therefore, is not an act, but a habit."  --Aristotle