Lava Walks in Hell's Half Acre- Twenty Mile Trail
Hiking in lava fields is unique because of the rough terrain, unusual scenery, and the contorted landscape. Since this is a Wilderness Study Area (WSA), permanent trails have not been developed. The unimproved hiking routes are marked with poles.
Blue top poles mark a route around a short loop which is a good introduction to lava hiking. The 0.9-mile loop takes about 30 minutes to walk. On this loop note the pressure ridges, deep cracks with ferns at the bottom, and moss on rocks.
Red top poles mark a 4.5-mile route to the main vent or source of Hell's Half Acre lava flow. This is a strenous hike and a round-trip to the vent can take a full day. Water is essential and boots with good soles are advisable. Estimated time to hike to the vent is 2-3.5 hours (one way).