The Rocky Mountain Horse name evokes images of western mountain ranges, yet this breed developed in eastern Kentucky's Appalachian foothills rather than the Rocky Mountains. The name likely originated from a foundation stallion called "Old Tobe" whose owner, Sam Tuttle, operated trail rides at Natural Bridge State Park and promoted horses of this type as "Rocky Mountain Horses." The name stuck despite geographical inaccuracy, becoming the breed's official designation.
Enthusiasts commonly call these horses "Rockies" in casual conversation, while some older sources reference them as Kentucky Mountain Horses, though this latter term now technically identifies a related but separate registry. The Rocky Mountain Horse Association (RMHA), established in 1986, maintains the official breed registry and sets standards distinguishing Rocky Mountain Horses from similar gaited mountain breeds.
The chocolate coat with flaxen mane and tail so strongly associated with the breed results from the silver dapple gene acting on a black base coat. While this coloring defines the breed's popular image, RMHA registers horses in solid colors including black, bay, palomino, and chestnut, recognizing that the breed's value lies in gait, temperament, and conformation beyond any single color pattern.
Related registries including the Kentucky Mountain Saddle Horse Association and the Mountain Pleasure Horse Association register similar horses with slightly different standards, creating occasional confusion about breed distinctions. Horses may be registered with multiple organizations if they meet respective criteria. The RMHA maintains the original Rocky Mountain Horse standards emphasizing the characteristics developed in eastern Kentucky's mountain communities.
The breed's relatively recent formal recognition—the RMHA formed less than four decades ago—means many living horses trace directly to foundation stock, with pedigrees documented through oral history and early registry records. This recent formalization preserved a distinct type that had existed informally for generations in Appalachian communities before gaining broader recognition.

