The Cozens Ranch House in Fraser, Colorado was built by William (Billy) Cozens, sheriff of Central City after he married Mary York. Mary insisted that they leave the wild mining town, so the Cozens family relocated to Grand County, where they started a ranch in 1874. The homestead was the first in the Fraser Valley. The original two-story ranch house was constructed in 1874. A stagecoach stop was added in 1876, where travelers coming up Berthoud Pass could stop for a hot meal or a room for the night. At its height the ranch comprised over .