Mauna Kea Trail, Hiking trail on Mauna Kea volcano, Hawaii, United States.

Mauna Kea Trail, also called the Humuʻula Trail, is a 6 mi (10 km) unmaintained dirt and scree path from the Onizuka Center at 9,200 ft (2,804 m) to the 13,796 ft (4,205 m) summit of Mauna Kea. It begins with 600 ft (180 m) on the access road, then crosses ʻaʻā lava flows between 11,000 and 12,800 ft (3,353–3,901 m). Cairns and reflective posts mark the route above 10,000 ft (3,000 m).

The trail follows part of an old Hawaiian route to Lake Waiau, a site of spiritual importance. Hawaiians travelled the mountain for generations to reach places used in religious and ceremonial life. The modern path to the summit was later marked from the Onizuka Center, and a sign now asks visitors to stop before Puʻu Wekiu, the summit cinder cone held sacred.

The mountain holds deep meaning for Hawaiian people as a sacred place connected to their spiritual traditions and practices. Visitors are expected to show respect by protecting the natural and cultural remains they encounter.

The high altitude makes this hike demanding, so bring warm clothes, sun protection, and at least 2 liters of water per person. Starting early and allowing time to adjust to the thin air will help you feel better and enjoy the walk more.

The path moves through different climate zones in a short distance, and winter snow can actually fall on this tropical mountain. This rare combination of snow in the tropics catches many visitors off guard and creates an unexpected experience.