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Although a Hollywood Reporter production chart includes Harry Carter in the cast, his appearance in the released film has not been confirmed. A July 1958 Hollywood Reporter news item notes that Stuart Whitman's three-year old son Mike was to make his screen debut in the picture, but his appearance in the released film has not been confirmed. According to Filmfacts, location filming was done in Eastern Colorado.
These Thousand Hills was the last novel in A. B. Guthrie's trilogy of the old West. The Big Sky, the 1949 novel that launched the trilogy, was filmed in 1952. The middle installment, The Way West, which won a Pulitzer Prize, was filmed in 1967 (see AFI Catalog of Feature Films, 1961-70.) Time magazine noted that the novel These Thousand Hills examined "how the men who won the West settled down to manage their estates, and in the process turned from Buckaroos to Babbitts." Time criticized the film adaptation for reducing Guthrie's story to "the common place."