Pu'u Ulaula (Red Hill)

Pu'u Ulaula sits 13,796 feet above sea level on Mauna Kea's summit, making it Hawaii's highest accessible point. This red cinder cone provides panoramic views across the Big Island and out to neighboring islands on clear days. The viewpoint sits above the cloud line most days, offering views of the island chain from an alpine desert environment. The summit attracts photographers, stargazers, and visitors seeking dramatic high-altitude views. Snow occasionally covers the peak from December through February, creating an unusual Hawaiian experience. The terrain consists of loose volcanic rock and cinder, so wear sturdy shoes with good traction. Drive the paved Mauna Kea Access Road to reach the summit area, though the final stretch requires four-wheel drive due to steep, unpaved sections. Most visitors park at the Visitor Information Station at 9,200 feet and join guided summit tours or continue with appropriate vehicles. No entrance fees apply, though donations support facility operations. Visit during late afternoon between 3 PM and 5 PM for optimal visibility, though weather changes rapidly at this elevation. Temperatures drop 40-50 degrees from sea level, often reaching near freezing even in July and August. Pack warm layers, water, and sunscreen since UV exposure intensifies at high altitude. Take altitude seriously. Thin air affects most people, causing headaches or shortness of breath. Skip the summit if you have heart or respiratory conditions, and spend 30 minutes acclimating at the visitor station before ascending. Pregnant women and children under 13 should avoid the summit entirely.