According to Mike Cothern of Idaho Magazine, "The first school district organized in 1912 with around thirty students and a single teacher holding classes on the second floor of the Reynolds Hardware and Implement building. Two years later, a grade school was erected in Castleford; high school classes began in that structure's upstairs in 1921".[8] The first class of seniors graduated in 1924,[9] and the school's gymnasium was built in 1926.[8]
Citizens passed a bond in 1949 to construct a high school building and a supplemental bond in 1951 to complete construction. Formal dedication of the original high school, located on Main Street, occurred in February 1952.
In 1960 the Board of Education consisted of George Blick, Art Reese, Minnie Kinyon, Clinton Quigely, B. P. Johnson, and Howard Barns. Floyd E. Bowers was the high school principal and the faculty members were Mrs. Hesseholt, Mr. Waite, Mrs. Haley, Mr. Heidel, Mr. Jackson, Mr. Marrs, Mr. Williamson, and Mr. Thomas.
In 2012 a teacher was sentenced to jail time for recording girls showering.[10]
Athletics
The Castleford Wolves participate in the following sports:[11][3]
In 2012, Castleford allowed Sierra Harr to participate on the boys golf team because there were not enough girls to field a team. Rival teams objected, and a rule change was proposed (and later rejected) by the Idaho High School Activities Association in an attempt to prevent her from playing on the boys team. With Harr, who hit from the same tees as the boys, the team won the state 2A title.[12][13]