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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
Colony, High School Students, Parents and Guardians
Welcome to the 2024-2025 school year!  As the summer moves ahead at lightning speed, I look forward to seeing you all back on campus for summer registration prior to our first day of school in August.        
I encourage you to read all the summer mailer documents and registration paperwork that will be coming to you via Parent Square.  If you email, phone number or mailing address have changed please be sure to contact the school so we can update our data base.  If you require assistance with the registration process you may attend the scheduled registration date that matches your students grade level(s):  Grades 10-12 will be held on 7/24/24 from 8:00am – 12:00pm.  Students can come to campus to pick up a copy of their schedule and take their ID picture (dress code will be enforced and no hats allowed). The student store will be open to purchase PE clothes and or Titan Spirit Gear.  
For parents/guardians of incoming freshmen, I invite you to attend our Parent Information Meeting in our auditorium which will take place on July 25th at 8:45am.  Topics of discussion will include, but are not limited to, importance of student engagement, COHS Academic Goals, and how you can best support our vision.  All attending freshman students can pick-up a copy of their schedule and take their ID picture (dress code will be enforced and no hats allowed). The student store will be open to purchase PE clothes and or Titan Spirit Gear.  
As we strive to meet achievement goals, I cannot stress enough how important it is for us to have open 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. John Corrow, Assistant Principal of Student Achievement.    
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 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 mentally and emotionally prepare for the 2024-2025 school year…it will prove to be a great one.
If there is anything you may need or if you have 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
Colony High School