Toll Mountain is a 7,409-foot summit in the Chisos Mountains of far West Texas within Big Bend National Park. It is the fourth-highest peak in both the park and the Chisos range, and its extrusive volcanic rock dates to the Oligocene, reflecting the volcanic origins of the mountains. With hot arid climate, wooded lower slopes, and drainage feeding Oak Creek, Blue Creek, and Juniper Draw in the Rio Grande watershed, it rises steeply above nearby terrain, especially above Juniper Canyon. The mountain was named for Roger W. Toll, a National Park Service leader who helped advance the creation of Big Bend National Park and died in 1936 after a Texas park commission trip.