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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

WeTip

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
Titan Nation,
 
Welcome to the 2024-2025 school year! I am thrilled to share that Colony High School is off to a fantastic start, with a strong first quarter filled with enthusiasm, hard work, and growth. As we continue to build on this momentum, we encourage you to stay connected with us through Parent Square and to actively engage in the Canvas Learning Management System. Your involvement is key to your students’ success so if you need assistant with these platforms, please call the school so we can assist you.
 
Attendance plays a vital role in academic achievement, and we ask for your partnership in ensuring students attend school every day and arrive on time to class.  The Positive Attendance Behavior Plan has shown great improvement with period-by-period attendance.  If your student is absent, please call to inform us of the reason so that we can support their learning as effectively as possible.
 
As we head into the Fall sports and Performing Arts season, we are excited to see our students showcase their talents and school spirit.  Whether it’s on the field, in the pool, or on the court our students do their very best to make themselves, their family and their school proud.  Please check our website or follow us on Instagram at Colony High for the latest up-to-date information.
 
Knowing the time as a High School student is critical, I want to be sure your students feel cared for and achieve at the highest level possible despite any barriers they may face.  Together, let’s make this school year one of growth, achievement, and community.
 
Love You All,
 
Mr. Mitchell
Principal, Colony High School