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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

Finals Schedule

Please see attached document for the Fall finals schedule.

Upcoming Events

Board Meeting

Time: 5 PM – 8 PM
Location: Alta Loma High School

Board Meeting

Time: 5 PM – 8 PM
Location: Rancho Cucamonga High School

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

Portrait of Dr. Tiffany Bunn
Dear Titan Families,
 
As we return from Winter Break and begin second semester, I want to welcome everyone back and share how excited we are to see our students again. I hope your time away allowed for rest, reflection, and meaningful moments with family and friends.
 
The start of a new semester is a powerful opportunity. It is a chance to reset, refocus, and recommit to personal and academic goals. I want to challenge all students to start and finish second semester strong. Whether that means improving a grade, strengthening study habits, increasing engagement in class, or getting involved in school activities, every effort matters. The habits you build now will shape your success for the remainder of the year and beyond.
 
I also want to take a moment to encourage our students and applaud the progress they have already made this school year. Each student has grown academically, socially, and personally since the fall. Growth does not always happen all at once. It often comes through perseverance, learning from mistakes, and continuing to move forward even when things feel challenging. Be proud of how far you have come and know that our teachers and staff are here to support you every step of the way.
 
As we begin second semester, I would also like to remind students and families that our No Cell Bell to Bell policy remains in effect. Cell phones and other electronic devices may only be used before and after school, during passing periods, and at lunch. During instructional time, devices should be stored away so students can fully engage in learning and classroom activities. This policy helps create a focused, respectful, and productive learning environment for all students.
 
To our families, thank you for your continued partnership and support. Together, we can ensure that second semester is a time of growth, achievement, and success for every student.
 
Welcome back and let us make this semester one to remember as we finish the year strong.
 
Sincerely,
 
Dr. Tiffany Bunn, Principal
Colony High School