Colfax High School is a four-year public high school in Colfax, California in the United States. It is in the Placer Union High School District in Placer County. The school currently serves about 700 students living between Auburn, Grass Valley, and Alta/Dutch Flat. The school itself is located on 40 acres in the Bear River valley north of downtown Colfax and adjacent to Colfax Elementary School.