Sweet Grass County is in Yellowstone Country Montana. Of the 56 counties in the state, Sweet Grass County is 37th in terms of its size (1,862 square miles). The total value of 1,000 acres of residential land recently listed for sale in Sweet Grass County, Montana, was roughly $26 million. The average price of residential acreage for sale in Sweet Grass County was $1 million. Browse all residential land and rural property for sale in Montana to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.