Tyndall Glacier, cirque glacier in Rocky Mountain National Park, Colorado, US

Tyndall Glacier is a small cirque glacier on the east side of the Continental Divide, in a cirque north of Hallett Peak in Rocky Mountain National Park, Colorado. It is both an ice glacier and a rock glacier: the lower portions consist mainly of rock debris with only a small portion of ice. It sits at about 3,743 meters, with Taylor Peak rising 3.4 km to the southwest.

Tyndall Glacier is named after John Tyndall, the Irish scientist and Alpine mountaineer who made the first ascent of the Weisshorn in 1861 and an early attempt on the Matterhorn before its first ascent. In that same year, 1861, Tyndall identified carbon dioxide as a heat-trapping greenhouse gas. The glacier bearing his name appears to be retreating.

The name comes from John Tyndall, the Irish physicist and Alpine climber who first ascended the Weisshorn in 1861 and made an early attempt on the Matterhorn. That same year he identified carbon dioxide as a heat-trapping gas. The glacier bearing his name is now retreating.

Tyndall Glacier sits at about 3,743 m on the east side of the Continental Divide, in a cirque north of Hallett Peak; Taylor Peak rises 3.4 km to the southwest. The ice is not a walking destination, so view the cirque from trails above Bear Lake and Emerald Lake in Rocky Mountain National Park. Snow and cold persist at this elevation; July averages about −1 °C.

The glacier is named after John Tyndall, the Irish physicist who in 1861 identified carbon dioxide as a heat-trapping gas and made an early attempt on the Matterhorn. The ice body bearing his name appears to be retreating, and its lower half is largely rock debris rather than solid ice.