The Sierra Prieta is a 14 miles (23 km) long[1] mountain range in central-northwest Arizona.

The range is attached to the northwest of the Bradshaw Mountains, and Granite Mountain, a recreation site, as well as a rockclimbing location, is part of the range's northeast section, overlooking Williamson Valley, further northeast.

The highest peak in the south is Mount Francis, 7,110 feet (2,167 m),[1] which borders the Bradshaw Mountains; Arizona State Route 89 traverses between the two mountain ranges.

It is often used as a shorter route through the lower elevation Skull Valley during winter snowstorms.

The Sierra Prieta range is known in cowboy camps around the world as "The Sierry Petes" a colloquial and period pronunciation of the name made famous in the cowboy poem by the same name but more widely known as "Tyin' A Knot In The Devil's Tail" by Arizonan, Gail Gardner.