The Missoula Independent, the city's alternative weekly newspaper, closed Tuesday, Lee Enterprises announced at 8 a.m.
All employees were notified.
"The Independent has consistently lost money for its owners and is not financially sustainable," said Matt Gibson, general manager for the Missoulian, the Ravalli Republic and the Independent.
Lee purchased the Independent from Gibson, who had owned it since 1997, in April 2017. The Missoulian and Ravalli Republic are also owned by Lee Enterprises.