Driving Roads / Beartooth Highway

This 69-mile run between Red Lodge and Cooke City zigzags up steep switchbacks to the 10,947-foot Beartooth Pass, one of the highest paved roads in the Northern Rockies. It runs about 69 miles along US-212 in Montana / Wyoming. Drive time: about 1 h 45 min one way.
Best time to go: Late May to mid October. Generally open from the Friday of Memorial Day weekend through mid October; snow can close it temporarily even in summer.

Sources: Length · High point · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.
Record the switchback climb to the pass and the whole road lands on your map. Cornering and the views are the story here, not top speed.
High-altitude switchbacks with snow possible even in summer; slow for hairpins and watch for changing weather and ice in shaded sections.
Open Road keeps every drive: the route on a map, the time and the distance. On iPhone and Android.