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Los Osos High School
24 Hour Attendance Line

(909) 460-5860

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Patriot Day Activity

Patriot Day Activity

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.   


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


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Schedule Distribution Week - Summer 2015

Date Grade Time
Tues., July 21

Cafeteria Lines
(No counselors available)

12:30 - 3:30
Wed., July 22 Juniors
Cafeteria Lines
(No counselors available)
8:00 - 11:00
Wed., July 22 Sophomores
Cafeteria Lines
(No counselors available)
12:30 - 3:30
Thurs., July 23

Freshman Orientation A-L
Meet in Gym
(No counselors available)




Thurs., July 23 Freshman Orientation M-Z
Meet in Gym
(No counselors available)
Fri., July 24 Make-Ups
Guidance Office
(No counselors available)
9:00 - 12:00
Tues., July 28 Senior Schedule Needs
8:00 - 9:30
Wed., July 29 Junior Schedule Needs
8:00 - 9:30
Thurs., July 30 Sophomore Schedule Needs
8:00 - 9:30
Thurs., July 30 Freshman Schedule Needs
12:30 - 2:00


Printable Version

Senior Picture Dates & Times

Below are the dates and times for senior portraits.  To schedule your senior portrait appointment, you must go to go.lifetouch.com and pick a day and time you can attend.  Please know that you are not required to purchase your pictures in order to have your senior photo in the yearbook.  Should you have any questions, please go to go.lifetouch.com or call (909) 204-4125. 

Senior pictures will be taken in the theatre foyer on the following dates and times:

Date Time
July 6 12:00-5:00
July 7,8,9,& 10 10:00-5:00
July 13,14,15,16,& 17 10:00-5:00
July 20,21,22,& 23 10:00-5:00
July 24 10:00-4:00


Week at a Glance


Aeries.net Parent Portal Accounts Now Available!


The Chaffey Joint Union High School District is pleased to announce the Aeries.net Parent Portal. This new tool allows parents the opportunity to electronically update student information and complete the summer mailer online. This process is optional and ready now! Here’s how to get started:

  1. Complete the letter received by mail or download a copy here and return to the LOHS guidance office.
  2. You will be contacted by LOHS with your unique code needed to open your Aeries.net Parent Portal account.
  3. Download instructions here on how to create your Aeries.net Parent Portal Account.
  4. When the Summer Data Confirmation Window opens in Aeries.net you will be able to update your student information online instead of completing most documents included with the summer mailer. Click here to view a brief video on completing your summer data using Aeries.net.

Click the link below to connect to Aeries.net:

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

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. 

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
     Don Bertucci, 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

Mrs. Petrocelli, Principal

Susan Petrocelli, Principal

Follow LOHS on Twitter

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Class of 2005 Reunion

Los Osos News

No news posted

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School Accountability Report Card

2013-2014 - English
2013-2014 - Spanish

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

NCAA Eligibility



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