Ontario 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. 
About Us Image
All CJUHSD students will graduate ready for college and careers.

Recent News

Canvas Logo


CJUHSD has adopted Canvas as our new Learning Management System

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.
  • 90% 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.
  • 500 Advanced Placement exams are administered to students at Ontario High School annually.

Principal's Message

Larry Rook, Principal
Ontario Jaguars,
We are underway with our distance learning schedule and despite these challenging times, our students are off to a great start to the new school year. Our commitment to ensuring your students are successful remain at our core, and stronger than ever. I commend our students, teachers, and families for adjusting to such unique circumstances in our schools. Despite all the uncertainties, our strive for excellence together remains strong.
I challenge students to remain focused on their success throughout this school year. I recognize that this year presents many new challenges and that you may become overwhelmed, rest assured that we too are learning and growing alongside you. As we are learning how to navigate our new Learning Management System, Canvas, we need to keep in mind that when learning new programs, it will take time to build confidence and comfortability. As you know, our primary instructional resources thus far have been Canvas and Zoom. I know some students and parents have had trouble accessing these programs, we will continue to provide support for students and parents by phone or in-person when necessary. Please make sure to call in or take advantage of our help desk here at Ontario HS.
We are very fortunate to have incredible students, teachers and families that make us an immensely strong community as we are all Stronger Together. I encourage you to stay connected to your son/daughter’s high school journey. If you have not already done so, please obtain a Canvas pairing code from your student in order to stay connected to your student’s academic progress.
Due to the distance learning model our traditional bell schedule has changed. Parents please review our distance learning schedule here and ensure students are engaging in learning tasks daily. 
Our teachers offer support throughout each day and in the afternoon between the hours of 1:45 – 2:35 pm via Zoom. I encourage students to reach out to your teachers through Canvas to schedule a time to receive tutoring help.
This school year we remain focused on continuing to prepare students for college and career. Please refer to the CA Dashboard to see our school's accomplishments about student achievement and college and career readiness. Our graduation, A-G, and freshmen on-track rates continue to increase, ultimately indicating that our Jags graduate with opportunities and have options upon graduation.
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!
We are Stronger Together!
Larry Rook