Kaʻū Desert Trail to Pepeiao

Kaʻū Desert Trail to Pepeiao is a one-way, point-to-point hike from the Highway 11 pullout to Pepeiao backcountry campsite. NPS lists the approach as 9.1 miles, though its mapped trail line measures about 7.9 miles and stops roughly a quarter mile from the cabin’s published coordinate. Use 9.1 miles for planning, but confirm the distance with backcountry staff before leaving. This is a remote, strenuous approach for fit, experienced hikers; allow most of a day and plan a permitted overnight or a carefully arranged exit.

The landscape looks desert-like because of Mauna Loa’s rain shadow, acidic rain associated with Kīlauea’s gases, and porous lava that drains quickly. Expect broken, uneven lava rather than a smooth path. Stone ahu mark the route, but they can be hard to spot in rain or mist. Stay on the marked trail: thin crust, ground cracks, and lava tubes can be difficult to see. There is little shade and no streams in this area.

A backcountry permit is required for Pepeiao. Carry at least four quarts of water per person per day; catchment water is not always available, and any collected water must be treated. The cabin is unsafe, so plan to tent camp. The site allows up to 16 hikers per night and three consecutive nights. Intense sun, wind, and high temperatures make this a poor choice without enough water, sun protection, and wilderness experience. Pets other than service animals are not allowed on park trails or in wilderness areas. Unexploded WWII ammunition may be present; do not touch it and report it to a ranger.

The separate Footprints walk reaches a shelter about 0.8 mile from the same trailhead. The footprints in the ash are associated with the 1790 summit eruption, when Native Hawaiians traveling through the area were caught in the ashfall. That short stop is a separate walk, not the route to Pepeiao.

The reward is a remote camp above the coast, with open ocean views across dark lava and grassland. The route to Pepeiao is one of three approaches NPS lists; Hilina Pali and Kaʻaha are different routes, so arrange your return or pickup before setting out. For the view, keep the dark lava foreground and ocean in frame to show the openness of the site.