Twenty Mile Trail✓ Official CampgroundUSFS
Twenty Mile Trail
campground Map
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About this site
5 mile trail to the main vent of the Hell's Half Acre flow. Trail routes are marked with poles across lava. A picnic area, fire ring and portable toilets are located at the trail-head.
This is treacherous rocky terrain and proper footwear is advised. It also gets very hot and there is little to no shade so proper sun protection and water is advised.
📞 208-524-7500
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Start the first trip hereCampground data provided by Recreation.gov · Updated Apr 2026
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