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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. 
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All CJUHSD students will graduate ready for college and careers.

Recent News

3rd Annual Teen Summit

3rd Annual Teen Summit

Calling all high school teens! It's time for the 3rd Annual Teen Summit. Please join us for this free event.

Attention: Class of 2021

March 2nd is the deadline to apply and guarantee maximum financial aid for college, but if you are late, you can still submit your application and may receive financial aid after the deadline until June 30.

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
Happy New Year! I look forward to a great year and what this new year will bring. We have experienced the most difficult year of our lives, and yet here we are standing strong and looking forward to brighter days because we are all stronger together. 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 striving to give our best each day. 
After reflecting on last semester, speaking with students and staff, we have made a few adjustments to the second semester schedule. These adjustments include: an earlier Monday 2nd period start time of 9:30 am, a revised distance learning schedule, and the opportunity for remediation of your first semester D/F grade. You can locate our revised distance learning schedule in your Canvas messages or on our school website.
Jags, along with these modifications we must be able to count on you to do your part. You must attend classes daily (this includes Monday’s 2nd-period check-in and the completion of asynchronous work), complete your assignments, and communicate with school personnel if you need anything. 
Lastly, please be aware that school will not be in session on the following dates:
January 18th – MLK JR. Day
February 8th – Lincoln’s Day
February 15th – Presidents Day
I want you to know that we believe in you and we are Stronger Together! You can do this, and if you need any help along the way, we are here for you. 
Go Jags!!
Principal Rook