Black Mountain, Summit in Pima County, Arizona.

Black Mountain is a summit in Pima County, Arizona, with a northeast ridge extending roughly a mile in length and rising about 1,000 feet above its base to reach an elevation around 3,700 feet. The peak features steep terrain with distinctive rock exposures and a clear ridge structure visible from surrounding areas.

The mountain contains ancient Hohokam fortifications at its summit, including stone walls and circular structures dating to pre-Columbian times. These remains provide evidence of indigenous settlement and construction activities in the region long before European contact.

The mountain is on the San Xavier Indian Reservation, 3.18 miles southwest of Mission San Xavier del Bac. The Hohokam stone walls, circular stone rings, petroglyphs and pottery sherds on the summit are not open to the general public, so the site is seen only from the surrounding land.

The mountain sits within reservation land and requires specific permissions for access, as it contains protected archaeological artifacts and cultural resources. Interested visitors should make inquiries beforehand to understand current access regulations and requirements.

Black Mountain is a lava-capped mesa, not a granite peak: its flat top is capped by volcanic rock, and the ridge runs northeast for 5,600 feet along Mission Road, nine miles southwest of Tucson. The summit holds the ruins of a Hohokam fortification, with long stone walls, circular stone rings, petroglyphs, man-made trails and pottery sherds still visible. Because the site lies on the San Xavier Indian Reservation, it is not open to the general public.