Why Idaho's highest peak is a monument to a senator and tectonic shifts

Countries & Cities · Published 30 September 2026 Swipe more like this →

In short: Borah Peak stands as Idaho's tallest summit, but its history is defined by more than just elevation. Named for a long-serving U.S. Senator, the mountain gained notoriety following a massive 1983 earthquake that physically reshaped the landscape, leaving a permanent scar on its western face that remains visible today.

Located in the Lost River Range within the Challis National Forest, Borah Peak was once nameless. It only earned its title after surveys revealed it surpassed Hyndman Peak in height. In 1934, the U.S. Geological Survey honored William Borah, a powerful senator and isolationist known as the Lion of Idaho, who had served for nearly 27 years. Borah later pursued the presidency in 1936 before passing away in 1940.

The mountain's geology is as volatile as its namesake's political career. On October 28, 1983, a 6.9 magnitude earthquake struck the region. The seismic event caused the peak to rise by approximately one foot, while the adjacent Lost River Valley dropped by roughly eight feet. This violent shift scarred the mountain's western side, a mark that persists as a stark reminder of the tectonic forces at play in eastern Custer County.

Climbing Borah Peak is a strenuous endeavor that demands respect. The standard route requires ascending over 5,200 vertical feet in just 3.5 miles. The most daunting obstacle is Chicken-out Ridge, a Class 4 arête that frequently forces hikers to turn back. For those seeking greater challenges, the north face offers year-round snow climbs, though the mountain's history includes tragic accidents, including an avalanche in 1977 and a fatal glissade in 1987. Recently, the USGS also recognized the mountain as home to Idaho's only active glacier, adding a new layer of scientific interest to this prominent summit.

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