Chaffey Joint Union High School District Calendar 2025

Chaffey Joint Union High School District Calendar 2025. The chaffey joint union high school district serves the communities of ontario, montclair, rancho cucamonga, and portions of fontana, upland, chino, and mount baldy. Chaffey joint union high school district main menu toggle.

With over 25,000 students, the district is the fourth largest high. June 2025 print year overview.