20 Mile Rock

Idaho Falls, Idaho

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Hike and explore a lava/desert playground close to Idaho Falls. The Hell’s Half Acre lava flow is one of several lava flows in Idaho’s Snake River Plain that erupted about 4,100 years ago. It’s 222 square miles, or 162,000 acres. The loop trail through this unusual terrain is marked by blue-tipped poles. Enjoy the abundant wildflowers such as evening primrose, Indian paintbrush, wild onions, penstemon, geraniums, and prickly pear cactus in May and early June. Since there is no actual trail other than following markers, you can take your time exploring the cracks and crevasses in the lava rock.
Hiking Idaho

DESCRIPTION FROM:

Hiking Idaho

by Ralph Maughan & Jackie Johnson Maughan (Falcon Guides)

Hike and explore a lava/desert playground close to Idaho Falls. The Hell’s Half Acre lava flow is one of several lava flows in Idaho’s Snake River Plain that erupted about 4,100 years ago. It’s 222 square miles, or 162,000 acres.

The loop trail through this unusual terrain is marked by blue-tipped poles. Enjoy the abundant wildflowers such as evening primrose, Indian paintbrush, wild onions, penstemon, geraniums, and prickly pear cactus in May and early June. Since there is no actual trail other than following markers, you can take your time exploring the cracks and crevasses in the lava rock.

© 2014 Ralph Maughan & Jackie Johnson Maughan/Falcon Guides. All Rights Reserved.

Activity Type: Hiking
Nearby City: Idaho Falls
Distance: 4.5
Trail Type: Shuttle
Skill Level: Easy to Moderate
Season: Best March through December
Local Contacts: Upper Snake Field Office BLM, (208) 524-7524
Local Maps: Hike and explore a lava/desert playground close to Idaho Falls.
Driving Directions: Directions to 20 Mile Rock

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Apr 2018