Twentymile Lava Trail

A 4.5 mile trail leads to the main vent of the flow. Both are marked with poles. It is unique because of the rough terrain, unusual scenery, and contorted landscape. Since this is a wilderness area, there are no permanent trails. The hiking routes are marked with poles. A good introduction to lava hiking is a route marked by blue top poles. The loop takes about 30 minutes to complete. 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 of Hell's Half Acre lava flow. This is a long hike and can take a full day. Water is important and boots with good soles are advisable. The time to hike to the vent is 2 to 3.5 hours.