The working title of this film was Spoilers of the North. Robert Ormond Case's novel first appeared as a serial in The Saturday Evening Post (3 June-8 July 1939). According to Hollywood Reporter news items, the film was partially shot on location at the Mammoth Lakes area of the Sierra Nevada Mountains in California. A February 5, 1942 Hollywood Reporter news item noted that the largest stage set used to date by Republic was being built on the studio's lot to accomodate some of the exterior snow scenes.