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Los Osos High School
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(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.   


Final Exam Schedule

Grades 9 - 11

  5/19/15 5/20/15 5/21/15
8:05 - 10:05 Period 3 Period 1 Period 2
10:05 - 10:18 Break Break Break
10:25 - 12:25 Period 5 Period 6 Period 4

0 period exams on 5/19, 5/20, & 5/21 from 7:02 - 7:58


Grade 12

May 13th & 14th (Wed & Thurs) Periods 2 & 4 Reg Bell Schedule
Tuesday, May 19th Periods 3 & 5 Finals Bell Schedule
Wednesday, May 20th Periods 1 & 6 Finals Bell Schedule



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Please review the following testing and calendar information:


Spring ushers in our testing cycle that will kick-off with the California High School Exit Exam (CAHSEE) for our sophomores. The class of 2017 will take the ELA portion of the exam on Tuesday, March 17th and the Math portion of the exam on Wednesday, March 18th. Please refrain (if possible) from scheduling appointments that will keep your 10th grade student out of school during these very important testing dates. Also, it is advised that students get adequate sleep the nights before the CAHSEE exams and eat a healthy breakfast the mornings of the tests.

California Assessment of Student Performance and Progress (CAASPP)

Eleventh grade students will be taking the Smarter Balance Assessments (SBAC) April 3-17. ELA exams will take place April 3-9 and the Math exams will be administered April 10-16. Exam make-ups are scheduled to begin on April 17th. In addition to our juniors testing, our sophomores will take the Life Science CA Standards test on Wednesday, April 8th. Please refrain (if possible) from scheduling appointments that will keep your student out of school during these very important testing dates. Also, it is advised that students get adequate sleep the nights before the exams and eat a healthy breakfast the mornings of the tests. Please click the following link if you would like to learn more about the 2015 CAASPP test: http://www.cde.ca.gov/ta/tg/ca/ 

Advanced Placement Exams (AP)

Exams will be administered May 4-15 for students enrolled in Advanced Placement (AP) courses who elect to take the exams.

Spring Break

Spring Break is right around the corner and will begin Monday, March 23 and conclude Friday, March 27th. We hope that everyone has an opportunity to have a fun and relaxing break and return to school rested and ready to get down to business. The conclusion of the spring semester is one of the busiest times of the year as we prepare to finish the school year and graduate our senior class.   

Dance Auditions

Thank you to everyone who auditioned for Dance!

The 2015 Dance Audition Placement Results

Please direct questions to Mrs. Eaton in the Activities Office

Week at a Glance


Tutoring Opportunites

LOHS Tutoring Opportunities

Before & After School (In Library)
Monday - Thursday

During Lunch (In Library)
Monday - Friday


No need to sign up, just go to the library for FREE TUTORING!!!

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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Los Osos News

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Important Senior Information

School Accountability Report Card

2013-2014 - English
2013-2014 - Spanish

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

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NCAA Eligibility



Register to Vote

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