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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

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.

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

  • 65% of Colony 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 Colony 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.
  • 900 Advanced Placement exams are administered to students at Colony High School annually.

Principal's Message

Mr. Mitchell
Colony Titans,
Welcome to the 2022-2023 school year! It was a pleasure having students back on campus for in-person learning for a full two semesters for the 2021-2022 school year.
Please look for your summer mailer through the US Postal Service to arrive between mid-June or early July. I encourage you to read all the documents enclosed, and make sure that all the forms in the registration packet are completed and ready to be turned in during our summer registration days (Posted on Website). For parents/guardians of incoming freshmen, I invite you to attend our Parent Information Meeting in our auditorium which will take place on the same day and time as your freshmen student’s orientation. Topics of discussion will include but is not limited to importance of student engagement and how you can support our vision.
As we progress with in-person instruction, I cannot stress enough how important it is for us to have open means of communication. Your engagement with Colony High School helps foster the relationship needed to support your student’s achievement. I encourage you to get involved with ELAC, AAPAC, School Site Council, or other stakeholder groups. For more information on where you can get involved, please contact the school, and ask for Dr. Tiffany Bunn, Assistant Principal of Student Achievement.
Last year we celebrated many cocurricular exceptional achievements: Colony Football won a Division 9 CIF Championship, Boys Basketball reached the Division I CIF Quarter Finals, Boys and Girls wrestling had participants in CIF as well as Masters, Boys Swim participated in CIF Finals, Golf Team participated in CIF Finals Boys and Girls Track had participants in CIF and Masters, Titan Regiment was finalist in the 2021 CSBC, Winter Guard earned a Silver Medal in the West Coast Winter Guard and Colony Percussion was awarded a Bronze Medal in the 2022 CSBC Percussion Competition. It was a great year to be a Titan.
It is my desire that students will come to Colony High School knowing there is opportunity to have fun, get connected to the Titan community, but more importantly will engage in our high-quality education and achieve our vision to graduate college and career ready. As this summer progresses, I hope for all to find time to rejuvenate, spend time with friends and family, and to mentally and emotionally prepare for the 2022-2023 school year…it will prove to be a great one.
If there is anything you may need or questions that need to be answered, please feel free to reach out to me or another Titan support person.
Love you all,
Thomas O. Mitchell
Principal, Colony High School