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Hot Rock
A giant rock carried out of the Lassen Peak crater by a mudflow.
Plan Around Hot Rock
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Hot Rock Details
In May 1915, a Lassen Peak eruption triggered a giant mudflow. The Hot Rock is a huge piece of dacite lava that was carried 4.5 miles from the volcano crater to the valley during the mudflow. There are a few of these "hot rocks," but this is the best-known: it's located next to the park road, a little east of Lassen Peak. The rock weighs about 300 tons and is smooth and black; it got its name from the fact that it was still sizzling 40 hours after it ejected from the crater. An interpretive sign offers additional information about the history and geology of the rock.
Difficulty
Low
Distance
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Estimated time
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Nearby Parks Around Hot Rock
Compare nearby parks around Hot Rock when deciding whether to expand the route after this stop.
Nearby Points of Interest Around Hot Rock
Use nearby POIs to quickly expand your options beyond Hot Rock while the map context is still fresh.
1.9 mi away
Devastated Area Trail
An easy walk that offers great views of Lassen Peak.
2.2 mi away
Paradise Meadows Trail
A 2.8-mile hike to Paradise Meadows.
2.3 mi away
Lost Creek Group Campground
A group campground with a minimum of 10 campers per site.
2.5 mi away
Crags Campground
Currently being rebuilt as the Volcano Adventure Camp.
2.5 mi away
Volcano Adventure Camp
A camping area that encourages future generations to get outside and explore.
