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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
Dear Jaguar Families,
We have had an amazing 23-24 school year, and I am so proud of all our accomplishments. The end of the school year is approaching, and our 9th -11th grade students will end the school year on May 23, 2024.  Seniors will attend our commencement ceremony on May 22, 2024, at 6:30pm in Jaguar Stadium. 
We have just a few weeks of school before finals, so students must work diligently to finish the semester successfully. Final progress reports have been mailed home, and it is imperative that all students and parents use that information to assess progress in each class. Also, continue to monitor Canvas and communicate with teachers and counselors if you have any concerns. 
Summer School will be in session beginning Thursday, June 3rd through Tuesday, July 2nd. I hope that your student is able to take advantage of the many opportunities that will be offered this summer. Please speak to your counselor with any questions about summer school classes.
Finals Exams will be held Tuesday - Thursday, May 21-23 (these are minimum days). All students should begin preparing for finals each night by reviewing the content that they learned. The final exam schedule is below:
Tuesday, 5/21 Wednesday, 5/22 Thursday, 5/23
Period 6 - 8:30-10:30 Period 5 - 8:30-10:30 Period 4 - 8:30-10:30
Period 3 - 10:50-12:50 Period 2 - 10:50-12:50 Period 1 - 10:50-12:50
Congratulations, Class of 2024! We are so proud of you!! 
Mr. Rook
Proud Jaguar Principal