Round Mountain is a small 6,185-foot (1,885 m) summit made of gray hornblende plagioclase trachyte in the Castle Valley in southeastern Grand County, Utah, United States.

Round Mountain is an extinct bysmalith, or igneous volcanic plug, that rises 1,000 feet (305 m) above the valley floor in 0.4 miles (0.64 km).

Precipitation runoff from the mountain drains into Castle Creek, which is a tributary of the Colorado River.

This desert climate receives less than 10 inches (250 millimeters) of annual rainfall, and snowfall is generally light during the winter.

Media related to Round Mountain (Grand County, Utah) at Wikimedia Commons