Phone: 303-688-8265 Cedar Hill Cemetery was established in 1875, one of the first cemeteries on the Colorado Front Range, and the only cemetery in Castle Rock. In 2005 the Douglas County Historic Preservation Board designated Cedar Hill Cemetery an Historic Landmark. Cedar Hill Cemetery was established in 1875, one of the first cemeteries on the Colorado Front Range, and the only cemetery in Castle Rock. The earliest dated stone in the cemetery (February 1867) is that of Maria Hammar, infant daughter of Benjamin and Isabella Hammar. \n\nIn 2005 the Douglas County Historic Preservation Board designated Cedar Hill Cemetery an Historic Landmark.