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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

Unity Conference Flyer

Back to School Unity Conference

A virtual summit designed for families to learn skills in navigating a return to school with focus on valuing humanity while considering the realities of two pandemics. This is a free event and pre-registration is required to attend.

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

Charlene Saenz, Principal
Dear Montclair Families,
We are quickly approaching the end of the school year. For students in grades 9-11, the last day of school will be May 20, 2021. Montclair parents and guardians, we are forever thankful for your ongoing support, patience, and partnership to ensure that our students were able to overcome the many challenges brought on by the COVID-19 pandemic. Despite the adversity faced by many throughout our community, we remained united and committed to supporting our students, thank you. 
Students, if you did not achieve your academic goals this school year additional support is available. We have expanded our summer school program to provide you with the opportunity to recover credits. We will have two sessions for summer school this year, one from June 8-30, 2021, and a second session from July 8-30, 2021. You should have already received an email about summer school enrollment. Please speak to your counselor with any questions about summer school classes.
Class of 2021, Seniors! I am so excited about our in-person graduation ceremonies. We are all so proud of you! Seniors, you will attend one of two graduation ceremonies on May 19, 2021, one at 3:30 PM and one at 7 PM in our beautiful Ben Baker Stadium.
Our Final Exams schedule for seniors is below: 
Thursday, May 13 – Periods 1,2,4
Friday, May 14 – Periods 5,6,7
Monday, May 17 – Report virtually to all classes
Tuesday, May 18 – Graduation Rehearsal Day
Wednesday, May 19 – GRADUATION DAY
Our Final Exams schedule for grades 9-11 is below: 
Monday, May 17 – Periods 1,2,4
Tuesday, May 18 – Periods 5,6,7
Wednesday, May 19 – Periods 1,2,4
Thursday, May 20 – Periods 5,6,7
Friday, May 21 – NO SCHOOL
Congratulations, Cass of 2021!
It has been a true honor and privilege to serve as your principal. Once a Cav, always a Cav!
Ms. Saenz
Proud Principal, MHS