Vera Ralston plays Joan Milna, who shares several thousand acres of valuable Montana timberland with her stepfather (John Alderson). Coveting Joan's property, lumber baron Eric Warren (Ray Collins) sends out his foreman Boyd Caldwell (Rod Cameron) to persuade her to sell. Instead, Caldwell falls in love with the girl, vowing to protect her trees from the eco-unfriendly Warren. Republic's wide-screen Naturama process is shown to good advantage throughout Spoilers of the Forest.
| Actor | Role |
|---|---|
 Rod CameronBoyd Caldwell | Boyd Caldwell |
 Vera RalstonJoan Milna | Joan Milna |
 Ray CollinsEric Warren | Eric Warren |
 Hillary BrookePhyllis Warren | Phyllis Warren |
 Edgar BuchananTom Duncan | Tom Duncan |
 Carl Benton ReidJohn Mitchell | John Mitchell |
 Sheila BromleyLinda Mitchell | Linda Mitchell |
 Hank WordenPat Casey | Pat Casey |
 John ComptonBilly Mitchell | Billy Mitchell |
 John AldersonBig Jack Milna | Big Jack Milna |
 Angela GreeneCamille | Camille |
| PPaul StaderDan | Dan |
| MMary Alan HokansonMarie Milna | Marie Milna |
 Raymond GreenleafClyde Walters | Clyde Walters |
 Eleanor AudleyMrs. Walters | Mrs. Walters |
 Virginia CarrollSarah the Maid | Sarah the Maid |
 Don HaggertyWilliams the Ranger | Williams the Ranger |
 Theresa HarrisNancy the Maid | Nancy the Maid |
| KKem DibbsDriver | Driver |