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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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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.
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Upcoming Events

Board Meeting

Time: 5 PM – 8 PM
Location: Colony High School
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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.
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Principal's Message

Portrait of Dr. Tiffany Bunn
Greetings Titan Community, 
 
The 2025–2026 school year is off to a fantastic start! From the very first day, the energy on campus has been electric — fueled by the enthusiasm of our students, the dedication of our staff, and the unwavering support from our families. At Colony High School, we are committed to making this a year of excellence in every way.
 
At Colony, no student walks alone. Our teachers, counselors, and support staff work side-by-side to ensure each student has the tools, resources, and encouragement they need to thrive. Whether it’s academic guidance, social-emotional support, or help navigating challenges outside the classroom, we are here for both our students and their families.
 
Academically, the California School Dashboard is one way we measure and celebrate progress — but it’s not just about numbers. It’s about ensuring our students are prepared for their next steps in life. Together, with strategic planning, student-centered lessons, consistent effort and community support, we will continue to grow in every performance category, demonstrating the strength of our programs and the resilience of our students.
 
Our mission is clear: help every student excel academically, socially, and emotionally. We set high expectations, but we also provide scaffolded supports so every Titan can meet and exceed those expectations. Success at Colony isn’t about going it alone — it’s about working together, learning from challenges, and celebrating achievements along the way.

Colony High School is more than a campus — it’s a place where students discover passions, build lifelong friendships, and find their voice. From clubs and athletics to academic competitions and performing arts, there is a place for every student to belong. Every program is intentional, designed to grow skills, character, and confidence.

We are privileged to be part of a school community where staff go above and beyond, where families partner with us in education, and where students rise to every challenge. At Colony High School, students don’t just receive an education — they experience a culture of care, opportunity, and purpose.
 
Here’s to a year filled with learning, growth, and Titan pride. Together, we will make this our best year yet!
 
With gratitude and high expectations,
 
Dr. Tiffany Bunn
Principal, Colony High School
 
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