Fairfield is a town in Teton County, Montana, United States. The population was 708 at the 2010 census. Fairfield is the self-proclaimed "Malting Barley Capital of the World" with 83,000 acres of irrigated cropland and 56,000 acres of non-irrigated cropland in production for the purpose of raising malt barley in the vicinity.Fairfield began as a station on the Milwaukee and is between Great Falls and Choteau and near Freezeout Lake, where as many as 300,000 snow geese and 10,000 tundra swans gather in March. Fairfield serves as a trading center for the farmers of Greenfield Bench. Irrigation now assures crops, but in earlier days a dry summer made the grass scarce and the name "Freeze-out Bench" was applied to the area. "Greenfield Bench" and Fairfield are now descriptive of the hay and grain fields surrounding the town.