Mauna Loa access and summit

A reservation or permit is required. Book ahead.

The NOAA Mauna Loa Observatory is a working scientific facility, not a tourist site — view from the perimeter, do not approach the buildings, do not interfere with instruments. The Observatory Road is one-lane in sections; pull over for descending traffic. The summit hike is a serious backcountry undertaking — extreme altitude, exposure, weather changes, no rescue available; only experienced hikers should attempt it. The Mauna Loa Summit Cabin requires an HVNP permit. Mauna Loa is sacred ground in Hawaiian cosmology; treat the broader landscape accordingly. Watch for flow activity reports from the Hawaiian Volcano Observatory; the volcano is active and protocols change with conditions.