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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

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Upcoming Events

Board Meeting

Time: 5 PM – 8 PM
Location: Colony High School
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School Facts

  • 56% of Ontario High School graduates meet the University of California and California State University A-G admissions requirements, making it a leader in San Bernardino County.
  • 85% of freshmen at Ontario 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.
  • 522 Advanced Placement exams are administered to students at Ontario High School annually.
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Principal's Message

Portrait of Larry Rook
Ontario Jaguars,
 
Welcome back to the new school year! We’ve missed you, and we are beyond excited to have everyone back on campus. Thank you for kicking off the 2025-2026 school year with such enthusiasm and energy. Our entire staff is thrilled to begin this journey with you, and we’re ready to make this year one of growth, success, and unforgettable memories.
 
At Ontario High School, the safety and well-being of our students and staff remain our top priority. We will continue to implement necessary precautions to maintain a safe and healthy learning environment for everyone.
 
Our commitment to your success is unwavering. High school is an exciting time filled with countless opportunities for learning and growth. We encourage you to embrace all that OHS has to offer whether that’s building relationships with your teachers, joining a club, trying out for a sport, or exploring the many extracurricular activities available. Studies show that students who get involved are not only more successful academically but also feel more connected to their school community, know where to turn for help, and thrive in a supportive environment.
 
As part of our mission to prepare all students for college and career success, OHS continues to offer a variety of extended learning opportunities. These include, before- and after-school tutoring, Saturday RISE programs, credit recovery, and enrichment classes during 0 and 7th period. Additionally, we encourage students and parents to stay connected through Aeries, Canvas, and Parent Square for real-time updates on attendance, grades, and class progress. Be sure to update your data confirmation information to stay informed!
 
Jaguars, your attendance and active participation are vital to your success. Be sure to follow the bell schedule, attend class on time, engage in discussions, and complete assignments to the best of your ability. We also encourage families to schedule off-campus appointments after school hours to ensure students can fully participate in their learning without disruption.
 
Our pursuit of excellence in education continues as we strive to provide the best experience possible. Through the California Dashboard, we will track our growth and areas for improvement, ensuring that we continuously enhance our programs. To learn more about our school’s performance, please visit the CA Dashboard.
 
Thank you for your ongoing support and for partnering with us to provide an exceptional educational experience for our students. Stay connected with us on X @OntarioHS and Instagram @ontariojaguars. Together, we will stay on the “Path of the Jaguar” and help our students achieve their goals, both in high school and beyond.
 
Let’s make this year unforgettable!
 
Sincerely,

Larry Rook
Principal, Ontario High School
 
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