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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: 12 PM
Location: Los Osos 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 approach the final days of the 2024–2025 school year, I want to take a moment to reflect on the incredible journey we've shared. This year has been filled with growth, resilience, and achievement—made possible by the unwavering dedication of our students, staff, and families. Thank you for your continued partnership and support.
 
With finals, graduations, and end-of-year celebrations just around the corner, it's a time to acknowledge the hard work and milestones our students have reached. From CAASPP and CAST assessments to AP exams, WASC Self Study and senior activities, our Titans have shown determination and perseverance. I am incredibly proud of all they have accomplished.
 
As we wrap up the school year, I encourage everyone to take time to celebrate the successes—big and small. Whether your student is moving on to the next grade or preparing for life beyond high school, this is a season of transition and opportunity. I hope summer brings rest, joy, and memorable moments with loved ones.
 
Thank you again for being an essential part of our Titan community. Colony High School looks forward to welcoming everyone back in the fall, recharged and ready for another great year.
 
It has been an honor serving you as the Principal of Colony High school and I want to thank you for sharing your Titan Scholar with me.
  
Love You All,
Mr. Mitchell