Steam Vents
These steam vents occupy the high alpine zone at 12,526 feet on Mauna Loa, where volcanic heat creates dramatic fumarolic activity in terrain nearly bare of vegetation. The site receives 12.3 inches of annual snow.
The landscape surrounding the vents consists of barren lava flows, sparse grasses, and exposed rock. Temperatures average 41.6°F despite the equatorial latitude, and hikers experience genuine alpine conditions complete with intense solar radiation and thin air.
Kilauea's geothermal system extends into Mauna Loa's upper flanks, where circulating groundwater achieves temperatures high enough to produce steam despite the high elevation. This intersection of volcanic heat and extreme altitude creates a unique geothermal environment.
Reaching this site requires nearly 4.7 miles of hiking from North Pit Trail. Expect challenging terrain, rapid weather changes, and serious altitude exposure. Visit during stable summer months when snow doesn't block routes.