Brockton is a census-designated place and former town in Roosevelt County, Montana, United States. The population was 358 at the 2020 census.
Brockton's first post office was established in 1904. Fort Peck Indian Reservation was opened to non-Native settlers in 1913 and the town boomed. It was incorporated in 1952,
Geography
According to the United States Census Bureau, the town has a total area of , all land.
Climate
Wolf Point 29 ENE is a weather station located roughly 12 miles (19.3 km) northwest of Brockton. Wolf Point 29 ENE has a humid continental climate (Köppen Dfb), bordering on a cold semi-arid climate (Köppen BSk).