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Los Osos High School
24 Hour Attendance Line

(909) 460-5860

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The Common Core State Standards Overview

Los Osos Guidance Department


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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

Register to Vote

Click the image above to register to vote.

Final Exam Schedule

Final Exam Date Periods
Tuesday, December 16th 0, 2, & 4
Wednesday, December 17th 0, 3, & 5
Thursday, December 18th 0, 1, & 6


Bell Schedule:  
0 Period 7:02-7:58am
1st Final 8:05-10:05am
BRUNCH 10:05-10:18am
2nd Final 10:25-12:25pm


* "0" period exams are taken during the regular class period
* December 16th - 18th are Minimum Days
* December 19th - Non-Student Day

Final Exam Schedule


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The 2014-2015 school year is off to a wonderful start and we look forward to a great year of continued Grizzly excellence filled with opportunity and promise. Thank you students, staff and parents for helping to create a very smooth opening of the school year. It is this type of partnership that has allowed us to accomplish great things at Los Osos High School, such as becoming a California Distinguished School—the only high school to earn this recent distinction in San Bernardino and Riverside counties. In less than thirteen years our school has earned a reputation of being a premier high school where our students excel in academics, athletics, the arts and activities.

Our primary focus remains student learning and achievement, and each teacher and staff member is committed to these goals. This is evident with our growth on the California High School Exit Exam in both our pass rates (95% ELA and 94% Math) and proficiency rates (78% ELA and 79% Math). Another area of growth for the Grizzlies is an 8.6 increase in our estimated A-G completion rate for the Class of 2014. Our goals for the year will be to continue to improve classroom instruction and student achievement by providing solid instruction, interventions and programs that will help our students meet their academic goals and prepare them for college and career readiness. 

Please know that we value our parent community and welcome your input and support. In order to better serve our students we ask that you partner with us to provide the best learning environment possible for all students.


Susan Petrocelli

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!!!

Free Vision Screening

The Cucamonga District Host Lions Club
is Sponsoring a

Saturday - December 6, 2014
8:00AM - 3:00PM

Lions Center East
9191 Baseline Rd.
Rancho Cucamonga, CA 91730


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:

Order Your Official Transcript Online!

The link above provides you with the ability to request transcripts online. Transcripts requested online are sent securely to the colleges, universities, or scholarship funds that you select.

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. 


Mrs. Petrocelli, Principal

Susan Petrocelli, Principal

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Important Senior Information

Los Osos News

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School Accountability Report Card

2012-2013 - English
2012-2013 - Spanish

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

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NCAA Eligibility