The highest peaks within the Bighorns are located in Wyoming in the 1.12 million acre (4,500 km²) Bighorn National Forest. Two peaks rise to over 13,000 feet (3,960 m) Cloud Peak (13,175 ft, 4013 m) and Black Tooth Mountain (13,005 ft, 3964 m). There are a dozen more that rise to over 12,000 feet (3,650 m). From the east the mountains present a vertical relief of over 8,000 feet (2,450 m), rising abruptly from the plains. Overall, the Bighorns are more rounded than their sister mountain ranges to the west.
Two more large roadless areas remained in the Bighorns as of 1992. It is unknown whether these areas have since been reduced in size by road-building and other development. Both areas straddle the Montana-Wyoming state line, in the northern part of the range. One area, north of U.S. Route 14A and containing the headwaters of the Little Bighorn River, is 155,000 acres of National Forest land. This little-known region features subalpine terrain cut by steep canyons. Pronghorn inhabit the area, as it includes a portion of the Great Plains. What little human use it receives is from hunters and fishermen. The second roadless area is located mainly on the Crow Indian Reservation in Montana; its 144,000 acres also includes 34,000 acres of Devil's Canyon on the Bighorn N.F. in Wyoming. In this part of the range, semidesert prairie is cut by steep canyons leading to Yellowtail Reservoir, and high, Douglas-fir cloaked ridges top out at over 9,000'. Colorful rock formations are common. Rocky Mountain juniper and limber pine are scattered on lower elevations, and wildlife includes pronghorn, rattlesnake, golden eagle, ferruginous hawk, and mule deer. The Crow Indians manage a wild bison herd on this portion of the Bighorns. The Crow lands are a sacred area, and thus are off-limits to non-tribal members.
The three highways traversing the Bighorns are designated Scenic Byways by the US Forest Service and the State of Wyoming. These include U.S. Routes 14, 14A, and 16.
In 2015, a sudden, huge 'gash' was found in Wyoming's Big Horn Mountains. The Wyoming Geological Survey studied the area and determined that "The Crack" may be the result of an "apparent active landslide" in the southern end of the Big Horn Mountains.
The Bighorns are a popular destination for hiking, backpacking, fly fishing, horse back riding and increasingly ATV riding and snowmobiling. Trails wind through most of the national forest. The Cloud Peak Wilderness has a network of hiking trails to remote areas and alpine lakes. Higher trails are often covered with snow except from July through August. After Labor Day, there is a good chance of high country snow storms at any time.
Georgen, Cynde. In the shadow of the Bighorns: A history of early Sheridan and the Goose Creek valley of northern Wyoming. Sheridan, Wyoming: Sheridan County Historical Society, 2010. ISBN 978-0-9792871-7-6.