Teewinot Mountain is a 12,330-foot peak in Wyoming’s Grand Teton National Park and the sixth-highest summit in the Teton Range. Its name, originally spelled Tee-Win-At, means “pinnacles,” reflecting a monolith broken into sharp spires. Within the 40-mile-long Teton Range, regarded as the youngest chain in the Rocky Mountains, Teewinot was uplifted beginning about 9 million years ago and later sculpted by glaciation. Its dramatic east face rises 5,600 feet above Lupine Meadows and is the mountain’s usual climbing route, ending in an exposed Class 4 scramble to a tiny summit. Broken Falls drops 300 feet down its eastern slopes.