Douglas County High School was built in the 600 block of Wilcox Street in 1907.

Groundbreaking at the school's current location on Front Street occurred in 1961.

[4] The new school location opened in 1967, and fourth through sixth grade students attended classes at the former high school location until Castle Rock Elementary was built in 1983.

Teams fielded by the school include baseball, basketball, cross country, football, flag football, golf, gymnastics, lacrosse, soccer, softball, swimming, tennis, track, volleyball and wrestling.

Douglas County High School adopted the International Baccalaureate program in 1996.