Green Grass of Wyoming is a 1948 American Western film directed by Louis King and starring Peggy Cummins, Charles Coburn and Robert Arthur.

Rob organizes other ranchers to hunt for Thunderhead who, like his grandsire the Albino before him, has stolen many mares from local ranches.

Meanwhile, Ken returns from a horse-selling trip but, to Rob's displeasure, has used the profits to buy a trotter race horse named Crown Jewel.

The next day, Rob leads a search party to find Crown Jewel and shoot Thunderhead, though Ken is determined to save him.

When Crown Jewel develops altitude sickness from living in the Wyoming hills, a veterinarian advises putting her down due to congested lungs; Greenway instead recommends an old-fashioned remedy that works.