Red Lodge is a city in and the county seat of Carbon County, Montana, United States. It is part of the Billings Metropolitan Statistical Area. The population was 2,125 at the United States Census, 2010. On September 17, 1851, the United States government signed a treaty with the Crow Nation, ceding the area which now contains Red Lodge to the Crow Indians. Rich coal deposits were found there in 1866, and gold was discovered nearby in 1870. An 1880 treaty between the U.S. government and the Crow allowed the area to be settled starting April 11, 1882.
In 1931 work began on the Beartooth Highway linking Red Lodge to Yellowstone National Park; it was officially opened in 1936. Red Lodge is well known for many outdoor recreation opportunities: skiing, mountain biking, and backpacking are nearby. In April it is host to a popular triathlon called the Peaks to Prairie. Research Association's Geology Field Station is located south of Red Lodge.