Yankee Boy Basin is an alpine basin in Ouray County, southwestern Colorado. It is in the San Juan Mountains, protected within Uncompahgre National Forest. The basin−valley is well renowned for its display of wildflowers during the spring bloom period, and for Twin Falls on Sneffels Creek.

Visiting

Access is provided by a dirt four wheel drive road which branches off the Ouray County road that runs from Ouray to Camp Bird Mine. The road starts a quarter mile south of Ouray, passes a DOT site, and winds its way up the canyon. Along the way are several primitive campgrounds that tend to be rarely visited. These encourage collecting dead-and-down firewood, though, which occasionally brings locals and people visiting other campgrounds. In general, though, the area is fairly private. Yankee Boy Basin is a good place to see native wildlife, including: deer, black bear, birds of prey, and other fauna of the southwestern Rocky Mountains region.