Castle High School offers classes in agriculture, art, business and computers, English, family and consumers science, industrial technology, mathematics, music and fine arts, physical education, science, social studies, resource education, and world languages.

Castle also offers advanced placement classes in English language, English literature, calculus, chemistry, US history, biology, government, macroeconomics, art history, and CS principles.

[4] Castle High School was founded in 1959 and later moved in 1975 to its current location on 92 acres (37 ha).

In 2004, a new wing was added to the school containing a large band facility, two science labs, and several classrooms.

In 2008, Castle began construction on a library, to supplement the existing media center, and also broke ground on the natatorium, containing an Olympic-size pool, both completed by the 2009-2010 school year.