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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. 
Colony High School campus photo
All CJUHSD students will graduate ready for college and careers.

Recent News

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

Tommy Mitchell
Greetings Titans,
Welcome to second semester of the 2023-2024 school year.  Our Fall Semester was definitely a successful semester in many ways.  We had another successful Fall Sports season with a League Championship on the football field and were competitive on the courts, in the pool, and across the local community. Our Titan Regiment had another successful season ending with a 2nd place finish at the 2023 CSBC State Competition.  
As we get going with this Spring semester it is super important to keep focus on achieving academically.  With all students there is much to look forward to these next five months.  For the class of 2024 Graduation is quickly approaching.  There is so much to look forward to with Winter Formal, the Renaissance Rally, Prom Rally, Prom, and other End-of-Year Senior Activities-this is the fun we all look forward to.  College applications have gone out and many will be receiving replies-this is the anticipated excitement we all look forward to.  It’s important to also keep focus on the expectation of learning-this is the key to the graduation ceremony we look forward to. I encourage our seniors to stay true to what’s important…academic achievement.
Students in grades nine through eleven also have much to look forward to.  Grade reports and transcripts are like resumes for what lies ahead after high school for both college and career, and a commitment to success is critical.  I encourage a personal commitment for students to attend school daily and to engage in each class session.  Parents and guardians play a critical role in the success of our students, and I appreciate your continued efforts.  There are many resources available for our Titan Scholars in the areas of tutoring, academic support & counseling, mentoring, and social/emotional counseling.  Please contact us for whatever you may need and trust we have your student’s best interests at the forefront of our decision-making processes.
If there is ever anything I can do for you please don’t hesitate to ask and remember-Everything We Do at Colony, We Do with Pride.
Love You All,
Mr. Mitchell