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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

Summer School

View the 2023 Summer School calendar and bell schedule.

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

Mr. Cho
Montclair Cavaliers,

Happy New Year. Welcome to the beginning of the second semester. We are excited to continue our campaign to “Go Big.” Montclair High School is ready to re-engage in the effective teaching and learning in the classrooms and in all the daily happenings of what takes place on our campus for 2023!

This is usually a time to set resolutions, and I encourage everyone to make the goal to pursue academic excellence this year. Remember that we are resetting and starting fresh in all of our courses. We have many resources that are available for you:

6th period CAV Academy
MAST Before and After School Tutoring
CAP Saturday Program
PAPER 24/7 Online Tutoring service
Canvas grade monitoring
Guidance Counselors
Please make sure to take an active role in your learning, and know that the entire Montclair High School staff is here to support you.

We are looking forward to a semester full of events in all areas -  academics, performing arts, clubs, and athletics. Please be aware of the following dates that school is not in session:

Monday, January 16 - Martin Luther King Day
Monday, February 13 - Lincoln’s Day
Monday, February 20 - Presidents Day

Here’s to a great beginning to the new semester. Go, Cavs!

Joshua Cho
Montclair High School