After the war, Hargrove wrote two novels: Something's Got to Give (1948) and The Girl He Left Behind (1956), which was made into a motion picture in 1956, starring Tab Hunter and Natalie Wood.
His credits include Bert D'Angelo/Superstar,[3] Cash McCall (1960) starring James Garner, The Music Man (1962) with Robert Preston, and television episodes of Maverick (1957) with James Garner, The Restless Gun (1957) starring John Payne, Colt .45 (1957), Zane Grey Theater (1957), the pilot script for 77 Sunset Strip titled Girl on the Run (1958) with Efrem Zimbalist Jr., The Rogues (1964) with David Niven, Charles Boyer and Gig Young, I Spy (1966) with Robert Culp and Bill Cosby, The Name of the Game (1969) with Tony Franciosa, Gene Barry and Robert Stack, Nichols (1972) with James Garner, The Brothers O'Toole (1973), The Waltons (1975), and Bret Maverick (1981) with James Garner.
Collaborator Roy Huggins discusses Hargrove at length in part 6 of his video interview with the Archive of American Television.
Hargrove was one of three Hollywood writers interviewed and analyzed at length in Prime Time Authorship (2002), by Douglas Heil.
While working at Warner Bros. in 1959, he was the center of a successful grass-roots letter-writing campaign to acquire a suitable couch for his office on the studio lot.