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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

Parent Academy College Workshops Featured Photo

Parent Academy College Workshops

This workshop will inform parents of the different types of financial aid programs available for paying for a college education to ensure that tuition, books, housing and educational expenses do not become an obstacle in preventing your child from attending college. Come be informed on how to access “FREE” financial aid from the government and learn about the FAFSA application process, Federal Grants, State Cal Grants, the student work-study program and student and parent loans.

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
In our new normal, it is so interesting how each day seems to be something new.  I am impressed with the efforts made by those involved with “All Things Colony” because of how we have weathered the storm of launching Distance Learning.  Of course, there have been wrinkles along the way, but we have all done our best to make it work…and its working. 
One of the most important aspects of working with high school age students is the personal connections that can be made on campus and within the instructional environment.  This Distance Learning Model does allow for some instructional environment connection. However, we are greatly missing out in the areas of campus life and cocurricular activities.  I applaud my staff in the efforts being made and look forward to continued growth as we move forward.
The posting of this letter marks the half-way point of the first semester.  I cannot impress on you how important it is for students to engage within the instructional day.  Being logged into Zoom is only part of the process.  When students interact daily with their teachers, the opportunity for growth in achievement is greater.  When students submit completed assignments either before or on due dates, teachers can gauge learning and offer feedback.  When students ask questions and/or search for clarification, the guessing goes away, and learning moves to the forefront.  If you need assistance in this area, please feel free to contact us and we will offer guidance.
As we move forward, know we will stay in contact by using both Canvas as well as our All-Call system.  It is important all parents/guardians have Canvas “Observer Accounts.”  If you need assistance with setting up an Observer Account, please ask your student to check their district email for step-by-step directions on how to first obtain a “Pairing Code.” 
Thank you for your continued patience and cooperation and know I/we are here to assist you in any way.
Mr. Mitchell