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

Upcoming Events

Board Meeting

Time: 5 PM
Location: Montclair High School

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 let’s kick off the second semester with excitement and determination! We hope you had a rejuvenating Winter Break and are ready to dive back into learning, growing, and making the most of this new semester. 
 
Seniors, this is your moment! Your final high school semester has officially begun! Stay focused, keep your eyes on the prize, and finish strong as you prepare to cross the graduation stage. Your hard work and dedication will make this milestone unforgettable! 

The start of a new year is the perfect time to reflect, recharge, and refocus. I encourage each of you to think about your successes and challenges from last semester and set fresh academic and personal goals for the year ahead. Let’s use this opportunity to reset and build habits that will set you up for success—both now and in the future! 
 
To help you reach your goals, we’ve got plenty of resources available for you: 

Before and After School Tutoring: Get extra help when you need it. 

4G Saturday School: Take advantage of this opportunity to catch up or get ahead. 

Canvas: Stay organized and on top of your assignments. 

Counselors and Teachers: Your biggest supporters are here to guide and cheer you on! 
 
Mark your calendars! Here are some important dates when school will not be in session: 

January 20th – MLK Jr. Day 
February 10th – Lincoln’s Day 
February 17th – Presidents Day 
March 24th – 28th – Spring Break 
 
Grizzlies, let’s make this semester one to remember! Keep Working hard, Inspire each other, Lead with integrity, and Dream big. Together, we’ll make our campus community stronger and achieve incredible things. 
 
Keep those Claws Up Grizzlies and remember that HWPO!   
 
Eric Cypher 
Principal  
Los Osos High School