Sula is a census-designated place in Ravalli County, Montana, United States. The population was 37 at the 2010 census.Sula is located at 45°50′12″N 113°58′54″W / 45.83659°N 113.98175°W / 45.83659; -113.98175, along U.S. Route 93 in southern Ravalli County. It lies along the East Fork of the Bitterroot River at the west end of Ross' Hole, a wide valley surrounded by mountains. It is 35 miles north along U.S. 93 to Hamilton, the county seat, and 58 miles south over Lost Trail Pass to Salmon, Idaho.According to the United States Census Bureau, the CDP has a total area of 3.3 square miles, of which 3.3 square miles is land and 0.039 square miles, or 1.09%, is water.This climatic region is typified by large seasonal temperature differences, with warm to hot summers and cold winters. According to the Köppen Climate Classification system, Sula has a humid continental climate, abbreviated "Dfb" on climate maps.