Colstrip is a city in Rosebud County, Montana, United States. The population was 2,096 at the 2020 census. Established in 1924 and incorporated as a city in 1998, Colstrip is the largest city in Rosebud County with 25.2% of the total population in 2020. Colstrip's primary industries are coal mining and electricity production. In 2005, Sports Illustrated’s 50th anniversary issue named Colstrip the top sports town in Montana.