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

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.

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
Happy New Year! I look forward to a great year and what this new year will bring. I hope you had a safe and restful Winter Break and that you’re excited about second semester. 2022 was a year filled with challenges but also opportunity. 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 strive to give our best each day. 
Remember: you are starting fresh. If you had a rough first semester, shake it off and turn it around. Your teachers are ready to help you get back on track. If you had a great first semester, keep it up or—better yet—take it up another level. 
Don’t forget about all the resources and support that are available to help you be successful:
After school tutoring
RISE on Saturday
PAPER tutorial service (free, 24/7 tutoring)
Your counselor
Your Principal and Assistant Principal’s!
Stay strong, focused, and continue to strive for excellence in all areas of your life. 
As a reminder, school is not in session on the following dates:
January 16th – MLK JR. Day
February 13th– Lincoln’s Day
February 20th– 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. Don’t forget #PowerofWE, we are all here to help and support you. Let’s have a great 2023 and second semester. 
Go Jags!! 
Principal Rook