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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
Happy New Year! I look forward to a great year and what this new year will bring. I hope you had a safe and restful Winter Break and that you’re excited about second semester. 2023 was a year filled with challenges but also opportunity. I am extremely proud of you and what you have been able to accomplish during this time. Let us enter this new year with hope and commit to strive to give our best each day. 
Remember: you are starting fresh. If you had a rough first semester, shake it off and turn it around. Your teachers are ready to help you get back on track. If you had a great first semester, keep it up or—better yet—take it up another level. 
Don’t forget about all the resources and support that are available to help you be successful:
Before/After school tutoring
RISE on Saturday
PAPER tutorial service (free, 24/7 tutoring)
Restart classes/Apex credit recovery
Your counselor
Your Principal and Assistant Principal’s!
Stay strong, focused, and continue to strive for excellence in all areas of your life. 
As a reminder, school is not in session on the following dates:
January 15th – MLK JR. Day
February 12th– Lincoln’s Day
February 19th– Presidents Day
I want you to know that we believe in you, and we are proud of you! You can do this, and if you need any help along the way, we are here for you. Don’t forget we are all Stronger Together, we are here to help and support you. Let’s have a great 2024 and second semester. 
Go Jags!! 
Principal Rook