Frenchtown's first settlers were French Canadians who came from Ontario and Quebec in 1864. Frenchtown anually celebrated June 24th as St. John's Day, in honor of the town's patron saint. The town was called Valley qua elth by the Indians, meaning 'state of tranquility.' The first post office was established in 1868 with Charles Cusson as postmaster. It was closed in 1869 and reopened in 1870. Hyppolite Lassere was appointed postmaster in March of 1873. Louis Barrette discovered gold in 1869 which brought 3,000 prospectors to the gulch.
Frenchtown is located in southwestern Montana, 16 miles northwest of Missoula on I-90.