199°F8,017 ftOpenShort WalkNational Park ServiceCamping nearby (4.7 mi)
Very Hot Source — Use Extreme Caution
At 199°F, the source water at Bumpass Hell is hot enough to cause burns. Some hot springs this hot have cooler side pools or downstream areas suitable for soaking — always test the water temperature before entering.
Image via Wikidata
Bumpass Hell reaches a boiling 199°F at Lassen Volcanic National Park's 8,017-foot summit zone, creating the park's largest and most spectacular hydrothermal field. This permanent natural-state preserve with open public access showcases the dramatic intersection of volcanic activity and high-altitude alpine terrain.
A short walk of approximately 4,200 feet from Lassen Peak Highway ascending through subalpine forest reaches this explosive geothermal landscape. Upon arrival, the terrain transforms dramatically—colorful mineral deposits paint the ground in yellows, oranges, and whites while steam vents and boiling mud pots testify to ongoing subsurface activity. The setting combines raw geological power with the fragile beauty of high-alpine vegetation struggling to survive in harsh conditions.
History of Bumpass Hell
Named for a 19th-century hiking guide reputedly burned by the scalding water, Bumpass Hell represents one of North America's most accessible major geothermal fields. The area's boiling pools, mud pots, and steam vents directly reflect the underlying magmatic system that fuels Lassen Peak itself. Geological monitoring documents ongoing changes in temperature and mineral chemistry as subsurface conditions evolve.
The moderately strenuous 4,200-foot hike rewards visitors with views unavailable from any road. Arrive early to secure parking and avoid crowds. Conditions vary dramatically by season—late June through September offer snow-free hiking, while spring and fall present variable conditions. Stay strictly on marked trails; thermal features concentrate in small areas surrounded by boiling water and unstable ground.
Is Bumpass Hell worth visiting?
Best for
Observing powerful hot springs
Overnight camping trips
Winter soaking with dramatic temperature contrast
Not ideal for
Casual soaking
Bumpass Hell is well suited for observing powerful hot springs and overnight camping trips.
Monthly Climate
25°Jan
25°Feb
28°Mar
33°Apr
41°May
52°Jun
61°Jul
60°Aug
53°Sep
42°Oct
31°Nov
24°Dec
Annual Precip: 45.7 inAnnual Snow: 208.9 in
Best Time to Visit
DecemberAir 24°F · Water 199°F · +175° contrast
JanuaryAir 25°F · Water 199°F · +174° contrast
FebruaryAir 25°F · Water 199°F · +174° contrast
December offers 37°F more contrast than July
USGS Field Measurements
Recent Temperature
37.4°F
(3.0°C)Measured Jun 30, 1981
Water ChemistrySampled 1981-06-30
The water at Bumpass Hell is neutral (pH 6.9) with 42 mg/L total dissolved solids.
Overview
Summit Lake South Campground (elevation 6,700 ft.) is conveniently located on the main road of Lassen Volcanic National Park. The campground is within walking distance of the small but scenic Summit Lake and eight miles from the 10,457-ft. Lassen Peak, the largest volcano in the park.
Hikers will find one of the park's major trails only 1/4-mile away from the campground and many more within a close proximity. Summit Lake South is on the opposite side of the lake from Summit Lake Nort...
Bumpass Hell has a water temperature of 199°F (93°C). This is considered a hot spring, well above body temperature.
Where is Bumpass Hell located?
Bumpass Hell is located in Plumas County, California at 8,017 feet elevation, near Chester. Coordinates: 40.4550°N, 121.5010°W.
How do I get to Bumpass Hell?
Bumpass Hell has Short Walk road access, with the nearest road being Lassen Peak Highway (0.8 mi from the road).
Is Bumpass Hell free to visit?
Bumpass Hell has Open access. It is managed by National Park Service.
Can I camp near Bumpass Hell?
Yes, Summit Lake South is located nearby (4.7 miles away).
What minerals are in the water at Bumpass Hell?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 6.9 (neutral). Total dissolved solids measure 42 mg/L.
Is it safe to soak at Bumpass Hell?
The water at Bumpass Hell reaches 199°F, which can cause severe burns. Do not enter the source pool directly — look for cooled side pools or downstream areas where the water has cooled to a safe temperature. Always tell someone your plans before visiting remote hot springs.
Is Bumpass Hell crowded?
Bumpass Hell sees varying levels of visitors depending on the season and day of the week.
What should I bring to Bumpass Hell?
Essentials for Bumpass Hell: swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.
