Greenhorn Mountain is the highest summit of the Wet Mountains range in the Rocky Mountains of North America. The prominent 12,352-foot (3,765 m) peak is located in the Greenhorn Mountain Wilderness of San Isabel National Forest, 5.2 miles (8.4 km) southwest by west (bearing 238°) of the Town of Rye, Colorado, United States, on the boundary between Huerfano and Pueblo counties. The summit of Greenhorn Mountain is the highest point in Pueblo County, Colorado. The peak's summit rises above timberline, which is about 11,500 feet (3,500 m) in south-central Colorado.