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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
Dear Montclair High School,

Welcome back! It has been an exhilarating start, with an abundance of enthusiasm and active engagement from our students that has truly set the tone for the months ahead. Our staff is ready to make this the best school year yet.

We have committed this year to DARE TO BE, meaning that we will encourage our students to reach beyond what they believe they are capable of, so that our students can find success inside and outside of the classroom. Our commitment to ensure that MHS students graduate ready for college and careers remains in place, and we are ready to provide a comprehensive set of academic programs during the instructional day as well as before and after school. Our MAST Tutoring program, CAP Saturday School, and Paper Online are some examples of how students can find additional assistance with their coursework. 

Montclair High School strives for excellence  to provide our students with the best possible educational program. The California Dashboard, our state’s accountability system, allows us to review data that identifies our school’s strengths and areas for growth. You can visit the California Dashboard for more information. 

This is a great time for students to look for ways to get involved on campus. We have various athletic programs, service organizations, and other extracurricular clubs that will be featured at our Club Rush on August 24 that will bring all the groups together in one location. Our families can also participate with us in different ways. We will be offering various parent workshops throughout the year. Please sign up for our ParentSquare communication app to receive more specific information about these events.

I am looking forward to meeting you at our upcoming events, beginning with our first Coffee with the Principal on August 29. You can follow me on X (formerly Twitter) @MontclairCavs for all the latest MHS news.

It is an honor to serve as your principal. Go, Cavs!


Joshua Cho