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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

WeTip - Be the solution


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

  • 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.

Principal's Message

Larry Rook
Ontario Jaguars,
Welcome back! We’ve missed you and are so excited to see you! Thank you for a great start to the 2023-2024 school year. Our staff and students are excited and ready to begin the year strong. With students back on campus, we will take the necessary precautions to maintain a safe and healthy environment for students and staff. 
Our commitment to ensuring your students are successful remain at our core, and stronger than ever. Making connections is critical to your success in high school. Get to know your teachers, join a club, try out for a sport, and take advantage of the many opportunities we have available at Ontario High School. Students who get involved tend to be more successful in their classes, know where to go for help when they need it, and feel like school is a safe and supportive environment.
As part of our mission to ensure that ALL students graduate ready for college and career, OHS continues to offer extended learning opportunities. We have Paper tutoring services, before and after school tutoring, RISE on Saturday, credit recovery, and enrichment classes during 0 and 7th period. Students and parents can also use Aeries, Canvas, and Parent Square to contact teachers, monitor attendance, and stay informed about academic progress in classes. Make sure to update your data confirmation information.
Jaguars, no matter the day or week, attendance is critical to your success. Make sure that you are following the bell schedule, attending class on time, participating in class discussions, and turning in your assignments. We encourage families to schedule off campus appointments after school to ensure students have the ability participate in class with little disruption to learning. 
We continue to strive for excellence in our programs and to provide our students with the best educational experience possible. The California Dashboard is our state’s school accountability system. As we continue to settle back into a regular school routine in our classes, we will continue moving forward with our data to better understand our areas of strength and our areas for growth. If you wish to learn more about our school’s data, please visit the CA Dashboard.
Thank you for your continued support and for partnering with us to bring about the best educational experience for our young Jaguars. Please follow me on Twitter @OntarioHS and on Instagram @ontariojaguars to stay connected to our school community! Together, we will succeed and keep our students on the “Path of the Jaguar” towards becoming College and Career ready. 
Larry Rook