Mosby (also Half-Breed Crossing) is an unincorporated community in southwestern Garfield County, Montana, United States. It lies along Highway 200 southwest of the town of Sand Springs, its nearest neighboring settlement.
History Originally known as Baldwin, this town takes its name from the area’s first settler, who arrived in 1891. Mosby had a post office that opened on June 29, 1904, was moved on February 18, 1983, and closed on July 30, 2015
Climate According to the Köppen Climate Classification system, Mosby has a semi-arid climate, abbreviated "BSk" on climate maps.Climate Summary for Mosby, Montana
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