Big Baldy Mountain, also called Mount Baldy, is the highest peak in Montana’s Little Belt Mountains, reaching 9,181 feet in Judith Basin County. Its bare, exposed summit gave rise to its name and has long made it stand out as a prominent landmark. Local accounts and some scientific opinion suggest the mountain and nearby ranges were shaped by intrusive volcanic activity, with magma rising near the surface without fully erupting during the mountain-building processes that formed the Rockies. In this view, escaping gases and receding material left sunken crater-like features, summit lakes, and other surface patterns that have invited comparisons to an ancient volcano.