Culbertson is a town in Roosevelt County, Montana, United States. The population was 753 at the 2020 census.
Culbertson was created in June 1887 following the arrival of the Great Northern Railway, then known as the St. Paul, Minneapolis & Manitoba Railway. The town was named after Major Alexander Culbertson, former head of the American Fur Company's Fort Union, to the east.
The settlement of Culbertson followed hard on the heels of the 1886-87 watershed years for the early cattle industry. As a result, the first settlers in the area raised horses for the US Cavalry’s various Montana and Dakota posts. As cattle prices slowly rebounded, the range was once again stocked with cattle, though the second wave of cattlemen utilized hardy English breeds instead of the Texas longhorns of the earlier outfits.
With the passage of new homestead laws in 1909 enabling homesteaders to take out larger acreages, the area saw an influx of dryland farmers. With its railroad connection, Culbertson became the center of the area’s agricultural trade. When the agricultural boom went bust after World War II and never resumed its former glory, Culbertson saw a gradual decline in businesses and population. This was somewhat ameliorated by a heavy railroad presence in the community.
Culbertson also became a surviving center as smaller adjacent communities dried up in the agricultural depression of the 1920s and 1930s. With better automobiles and better roads, farmers and ranchers could live farther from centers of trade.
According to the United States Census Bureau, the town has a total area of , all land.
According to the Köppen Climate Classification system, Culbertson has a semi-arid climate, abbreviated "BSk" on climate maps.
As of the census of 2010, there were 714 people, 296 households, and 191 families residing in the town. The population density was . There were 336 housing units at an average density of . The racial makeup of the town was 88.9% White, 0.3% African American, 6.3% Native American, 0.1% Asian, 1.0% from other races, and 3.