Flat Top Mountain is the highest summit of the Flat Tops in the Rocky Mountains of North America. The prominent 12,361-foot peak is located in the Flat Tops Wilderness, 19.1 miles south-southwest of the Town of Oak Creek, Colorado, United States, on the drainage divide between Routt National Forest and White River National Forest. The summit of Flat …Flat Top Mountain is the highest summit of the Flat Tops in the Rocky Mountains of North America. The prominent 12,361-foot peak is located in the Flat Tops Wilderness, 19.1 miles south-southwest of the Town of Oak Creek, Colorado, United States, on the drainage divide between Routt National Forest and White River National Forest. The summit of Flat Top Mountain is the highest point in Garfield County, Colorado.