Tumalo Mountain, Shield volcano in Cascade Range, Oregon, US.

Tumalo Mountain is a shield volcano in the Cascade Range of central Oregon, set just northeast of Mount Bachelor across the Cascade Lakes Scenic Byway. Ice Age glaciers carved a large cirque into its northeast flank, leaving a bowl that backcountry skiers use today. A route up the southwest flank reaches the summit.

The United States Forest Service built a fire lookout tower on the summit in the 1930s. It was abandoned in the 1970s and soon afterward removed, leaving no structure today.

The name Tumalo comes from the Tumalo band of the Northern Paiute, who lived along the Deschutes River. The northeast bowl left by ice-age glaciers is now a backcountry ski and snowboard area used by riders from Bend, about 27 km to the west. A trail on the southwest flank leads hikers to the summit.

The summit is reached via established trails on the southwest side that offer steady access to the peak. These paths provide views of neighboring volcanic peaks and the broader mountain landscape.

The glacial cirque on the northeastern flank creates a natural bowl that attracts backcountry skiers and winter visitors. This geological formation transforms the peak into a winter sports destination for experienced adventurers.