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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 Families,

We are approaching the end of the school year! The fourth and final quarter involves a lot of important events and activities that will keep us busy. We have made it to this point and our students have successfully navigated through these eventful times. We ask that all students continue to push through and to do their best in all their academics and extracurricular obligations. We have faith in our Cavaliers!

Springtime brings up the important annual statewide assessments. Students who are designated as English Learners have already taken the ELPAC (English Language Proficiency Assessments for California). Our Juniors will take the CAASPP (California Assessment of Student Performance and Progress), and our Seniors will take the CAST (California Science Test). Finally, students enrolled in AP classes will be taking the AP Exams beginning in May. The hard work they have put in throughout the year and the strong instruction they have received in the classrooms will be reflected in these meaningful academic measures.

Here are the dates:
ELPAC (EL Students)   February 2 - 9, 2024

CAST (12th Grade)   March 19 - 21, 2024

CAASPP (11th Grade)  April 2 - 24,  2024
AP Exams (10th - 12th Grade) May 6 - 17, 2024

There are also happenings taking place outside of academics that we would like to highlight. Spring sports are underway, and our Track and Field, Swim, Softball, Baseball, Golf, Boys Tennis, and Boys Volleyball teams are competing hard in their respective areas. Our Drama production of The Wizard of Oz (March 15, 16, 20, 21) promises to be a great show. Prom is also on the horizon (April 6), with our ASB planning for this great event. As always, we encourage our students to prioritize their time so that they can strike a strong balance between academics and extracurricular activities. Our teachers are here to provide support, and our MAST Tutoring, CAP Saturday school, and Paper online tutoring are available for our students as well. 

Go, Cavs!

Joshua Cho
Principal, Montclair High School