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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

Unity Conference Flyer

Back to School Unity Conference

A virtual summit designed for families to learn skills in navigating a return to school with focus on valuing humanity while considering the realities of two pandemics. This is a free event and pre-registration is required to attend.

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
Dear Jaguar Families,
The end of the school year is approaching, and our 9-11 grade students will end the school year on May 20, 2021.  Seniors will attend one of two graduation ceremonies on May 19, 2021, at 3:30 PM and at 7:00 PM in Jaguar Stadium.
We are forever thankful to our Jaguar families for all your support, patience, and partnership to ensure that our students were able to overcome the many challenges brought on by the COVID-19 pandemic. Our students have accomplished a lot this school year, although we were confronted with historical challenges beginning the year with distance learning, and now hybrid learning, our students rose to the challenge.
We will have two sessions for summer school this year, one from June 8-30, 2021 and a second session from July 8-30, 2021.  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.
Our Final Exams schedule is below: 
Monday, May 17 – Periods 1,2,4
Tuesday, May 18 – Periods 5,6,7
Wednesday, May 19 – Periods 1,2,4
Thursday, May 20 – Periods 5,6,7
Friday, May 21 – NO SCHOOL
Congratulations, Class of 2021! We are so proud of you!!
Mr. Rook
Proud Principal, OHS