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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

Summer School

View the 2023 Summer School calendar and bell schedule.

Drive for Excellence - New Car Giveaway!

This school year seniors from Ontario HS, Colony HS, Etiwanda HS, & Alta Loma HS will be eligible to participate in the Drive for Excellence New Car Giveaway.
WeTip - Be the solution


Be the Solution. If you have information regarding crime or misconduct at your school, call WeTip anonymously.

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

Mr. Rook
Ontario Students and Parents, 
As we enter the 4th quarter, it is hard to believe we are already at this point. I want to encourage ALL students to finish strong, you all have come so far this year, and we are so proud of you. 
When we return from Spring Break, the academic testing season will begin. We will begin the administration of the Smarter Balanced Assessment Consortium (SBAC), and Advanced Placement (AP) Exams. Students and staff have been working hard to prepare for these upcoming exams. These are just two of the indicators that are used by the state to measure the overall success of our school. 
I encourage you all as Jaguars to stay strong and determined to succeed. We are here to support you in any way that we can.
Testing information:
12th grade students will be taking the California Science Test (CAST- All seniors will take the exam during the week of April 19-20). 
11th Grade- California Assessment of Student Performance and Progress (CAASPP) -All 11th grade students will take this exam and will be taken on a computer. Our students use computers daily and will be well prepared!
CAASPP Testing Schedule: OHS CAASPP Schedule
CAASPP Block Bell Schedule: CAASPP Bell Schedule
11th grade English- April 5-14 
1th grade Math- April 17-26
May 1-12 Advanced Placement (AP) tests- students taking these exams will have the opportunity earn college credit should they earn a score of 3, 4 or 5 on the exam.
Please remember that we have tutoring after school, Monday-Thursday from 3:30-4:30 p.m. and our library is open from 7:15-8:15 a.m. and 3:30-4:30 p.m. Monday-Thursday.
We are proud of our students' hard work, and I know that our teachers are properly preparing our students for their exams.
I encourage you to explore California’s school accountability system, the California School Dashboard which outlines our school’s progress in several areas, including graduation rate and college/career.  Follow the link below for more information: 
Go, Jaguars!  
Larry Rook