Stainback Highway from Hilo

The Stainback rises 29.5km through wooded valleys and open mountainside, gaining 1,502m to 1,576m. Averaging 5.1%, the road kicks to 9.2% at its steepest — a notable steepening that demands respect. This is a climb of endurance — the kind of effort measured in hours, where pacing matters more than power. The road reaches 1,576m — high enough to feel the altitude on tired legs. Located in Hawaii, United-states.