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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.
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

We are coming close to the end of the school year, and it has been such a memorable one! Thank you for pushing through and for all your hard work so far. In these last few weeks, it is my hope that you do your absolute best to finish your coursework strong. Please take advantage of the different opportunities to prepare for your summative assessments and projects. Also, please continue to monitor Canvas and ParentSquare to keep track of your progress and to maintain communication with teachers, counselors, and administrators. Attending school every day is crucial to ensure that you are staying up to date and receiving appropriate instructional support. This message is especially important for our Senior Class of 2023, as we want to see you at our Graduation Ceremony in Montclair High School’s Ben Baker Stadium on Wednesday, May 24th at 6:30 pm. Our summer school will be broad and comprehensive and will offer enhanced sessions to provide opportunities for our students.

Here are the dates for our key upcoming events:

Senior Finals → May 17-23
Graduation → May 24
Finals for 9th, 10th, and 11th grades → May 23-25
Last Day of School → May 25
Summer School → June 1-30
I am thrilled and honored to continue to serve as your principal. Congratulations to our seniors, and welcome to our incoming freshman class of 2027 to Montclair High School, the best high school in the world!

Proud Principal Joshua Cho