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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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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

  • 69% of Montclair High School graduates meet the University of California and California State University A-G admissions requirements, making it a leader in San Bernardino County.
  • 88% of freshmen at Montclair 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.
  • 1000 Advanced Placement exams are administered to students at Montclair High School annually.

Principal's Message

Joshua Cho
Montclair Families,
As we near the end of another school year, I want to take a moment to express my sincere gratitude for your support and dedication. It has truly been a remarkable journey, filled with growth, achievement, and many memorable moments. Students, your enthusiasm, hard work, and determination have shone through brightly this year. From participating in classroom discussions to showcasing your talents in extracurricular activities, you have continually demonstrated what it means to be a Cavalier. Thank you for making this year truly extraordinary.
As we enter the final stretch, now is the time to dig deep, stay focused, and finish strong. I have every confidence in your abilities to excel in your final exams and projects. Remember, your hard work and dedication will pay off, setting the stage for a bright and promising future ahead.
Here are the dates for the main upcoming events:

     - Senior Finals →  May 15 - 21, 2024
     - Graduation →  May 22, 2024 at 6:30 PM at MHS Stadium
     - Finals for 9th, 10th, and 11th grades → May 21 - 23, 2024
     - Last Day of School → May 23, 2024
     - Summer School → June 3 - July 2, 2024

As we prepare to bid farewell to another school year, let us reflect on the memories we've created, the challenges we've overcome, and the friendships we've created along the way. Together, we have accomplished great things, and I have no doubt that the best is yet to come.Thank you once again for your continued support and dedication to our Montclair High School community. Wishing you all a successful conclusion to the academic year and a restful and rejuvenating summer break.
Warm regards,
Joshua Cho
Montclair High School