Builders FirstSource is the nation's largest building materials supplier. Our Montrose CO Lumber Yard proudly serves builders, contractors & remodelers in Montrose and surrounding Colorado Western Slope Area with their building supply & construction needs. This facility offers the following building supplies & services: Lumber and Building Materials, Trusses, Wall Panels and Components, Windows, Design Center & Showroom, Customer Pick Up | Will Call, Walk-In Customers Welcome. Visit us today to discover why we are known as builders' first choice!