Are dogs allowed on Twentymile Lava Trail?

Yes, dogs are allowed on Twentymile Lava Trail but must be kept on a leash at all times. Pack out waste and respect wildlife.

Do I need a permit to hike Twentymile Lava Trail?

No, Twentymile Lava Trail does not currently require a permit. Still check for seasonal closures or day-use fees with the managing agency before heading out.

How difficult is Twentymile Lava Trail?

Twentymile Lava Trail is rated moderate. It is 9.6 miles long with 518 feet of elevation gain. Difficulty ratings reflect a combination of distance, elevation gain, and terrain — your experience will depend on your fitness level and trail conditions.

Status unknown — verify before visiting

We don't have current condition data for this trail. Check with the land manager before you go.

See Idaho trail conditions

ModerateOut and Back

Idaho

Twentymile Lava Trail

Idaho Falls, Idaho

9.6 mi

Distance

518 ft

Elev. Gain

3h 23m

Est. Time

Out & Back

Route Type

Moderate

Difficulty

About This Trail

Imported description

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.

Trail Conditions

Unknown

We have no current condition data for this trail. Check with the operator before you go, and submit a report below if you've been recently.

No recent condition reports. Be the first to share what you see on the trail.

Elevation Profile

Min:1,561 ft

Max:1,616 ft

158 ft

Trail Details

Route Type: Out & Back
Surface: Dirt

Official sources & verification

We don't have curated agency sources for this trail in our cache yet. Outdoors is not the permitting authority — confirm conditions, permits, and access with the managing agency before you go. If you know who manages this trail, please tell us.

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Legacy import — verify before navigating

Path geometry came from our pre-launch legacy database. Routes have not yet been re-verified against the operator and may differ from the actual trail.

Hunt context