The station was founded as CJOC in 1926, named after its founder, Jock Palmer. In 1928, it was bought by Taylor Pearson & Carson, which evolved into Selkirk Communications. Originally on 1100 AM, it moved to 1120 in 1928, 1400 in 1942 and 1200 in 1960.
Along with most of Selkirk's radio holdings, CJOC was sold to Rogers in 1989 after Selkirk merged with Maclean-Hunter. On January 19, 2000 CJOC moved to FM under new calls, CJRX. With the new frequency and call letters also came with a change in genre, from country music to rock.