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Los Osos High School Home

About Us

The Chaffey Joint Union High School District serves the communities of Ontario, Montclair, Rancho Cucamonga, and portions of Fontana, Upland, Chino, and Mount Baldy. With over 25,000 students, the District is the fourth largest high school district in California. It has eight comprehensive high schools, a continuation high school, an online high school, a community day school, an adult school, and alternative programs. The District offers a wide variety of instructional options that provide a quality education for each student, every day. The District's well-prepared, dedicated, and highly qualified teachers and support personnel are second to none.
 
The Chaffey Joint Union High School District Board of Trustees are steadfast in the belief that "Nothing is more important than student learning and their achievement."
 
Our daily purpose encompasses our commitment:
"To provide student learning, and ultimately their achievement, of the prescribed curriculum that takes place in the classroom under the direction of the teacher." The Chaffey District supports this daily act. We realize that our efforts uniquely influence the future of our community and of this nation, and we are passionate about doing whatever it takes to prepare students to be successful and contributing citizens of the 21st century.
 
The Chaffey District has provided a quality education for high school students in the area since 1911. As the District continues to grow and progress, we are poised to meet the challenge of providing the finest quality education possible for every student. 
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All CJUHSD students will graduate ready for college and careers.

Recent News

WeTip - Be the solution

WeTip

Be the Solution. If you have information regarding crime or misconduct at your school, call WeTip anonymously.

The Chaffey District Cares

The Chaffey District cares about your mental well-being. We partner with community agencies and mental health professionals to provide support to our students and staff. If you, or someone you know, is in crisis please contact the Community Crisis Response Team (909) 421-9233 - Click 'Read Full Story' for more information.

Upcoming Events

School Facts

  • 78% of Los Osos High School graduates meet the University of California and California State University A-G admissions requirements, making it a leader in San Bernardino County.
  • 98% of freshmen at Los Osos High School complete their first year of high school on track to graduate.
  • The CJUHSD has been named a Top Workplace by the Press-Enterprise and Inland News Group.
  • 2500 Advanced Placement exams are administered to students at Los Osos High School annually.

Principal's Message

Eric Cypher
Grizzlies, 

Welcome back and welcome to the start of second semester! I hope you had a restful Winter Break and that you are ready to finish the year strong!   
 
It has always been my practice as I begin the new year to reflect on my previous years goals and to realign them for the new year, a simple New Year’s tradition!  I challenge to you do the same and some time to reflect on this past year/semester and set some academic and personal goals.  This is a great opportunity to reset and start anew; but to really put in some practices in place that will become habits!
 
To help assist in creating those habits here some resources that are available to help you on tract to meet those academic goals:
 
After school tutoring 
Paper Tutoring Services 
4G Saturday School 
Canvas 
Counselors and Teachers 

Some of you may have been or continue to be impacted by COVID-19, and it appears the Omicron variant has spread quickly in our region. Thankfully, typical symptoms seem to be less severe in most cases when compared to previous strains. In any case, students should remain at home if experiencing any COVID-related symptoms or if they are unvaccinated and recently been in close contact with someone who is COVID positive.   
 
As a reminder, school is not in session on the following dates: 

January 17th  – MLK JR. Day 
February 14th – Lincoln’s Day 
February 21st – Presidents Day 
March 21st - 25th – Spring Break  
 
Stay strong Grizzlies remember to continue to work hard, inspire other, lead with integrity and dream big!
 
Claws Up!  
 
Eric Cypher
Principal 
Los Osos High School