Bumpass Hell

Bumpass Hell sits atop a pocket of intense underground heat, where groundwater is superheated by the volcanic system below. That heat drives an array of features: mudpots that plop and bubble, fumaroles that hiss out steam and gas, and hot springs and pools colored by minerals and microbes into shades of turquoise, gray, and milky blue.

The smell of sulfur hangs in the air, and the ground steams and rumbles, giving a vivid sense that Lassen is very much an active volcanic area. The boardwalk winds through the heart of the basin, bringing visitors close to the features while keeping them safely off the fragile, dangerously hot crust.

The trail to Bumpass Hell is about 3 miles round trip, with some ups and downs and a bit of elevation change, and it passes rocky slopes with views of the surrounding peaks and Lake Helen before descending into the hydrothermal basin. Most visitors find it a moderate, rewarding hike.

Because the area sits at high elevation, snow can block the trail well into early summer, so it is important to check current conditions before going. Once there, staying on the boardwalk is essential: the ground can be a thin crust over boiling mud, and the water is hot enough to cause severe burns, so venturing off the walkway is extremely dangerous, especially for children and pets.

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is a place we chose through independent editorial review, never a paid placement.

Bumpass Hell is the largest hydrothermal area in Lassen Volcanic National Park, California, a steaming basin filled with boiling mudpots, hissing fumaroles, and vividly colored hot pools. Reached by a roughly 3-mile round-trip trail and explored on a network of boardwalks, it offers a close, safe look at the volcanic forces still active beneath the park. The sulfur-scented landscape bubbles, steams, and rumbles, with pools tinted turquoise and milky blue by minerals and heat. Its unusual name comes from Kendall Vanhook Bumpass, an early guide who badly burned his leg after breaking through the thin crust into a boiling pool. It is a striking place in the park to witness Lassen's ongoing volcanic activity.

Bumpass Hell is named after Kendall Vanhook Bumpass, a cowboy and early guide who explored the area in the 1860s. According to the story, while showing the steaming, otherworldly basin to visitors, Bumpass stepped on what looked like solid ground but was actually a thin crust over a boiling hot spring. He broke through and severely burned his leg, an injury that reportedly led to its amputation. He is said to have described the place as a version of the fiery underworld, and the name Bumpass Hell stuck, capturing both his misfortune and the hellish, boiling character of the landscape. The story is also a lasting reminder of exactly why visitors today must stay on the boardwalk and never step onto the fragile, scalding ground.

The hike to Bumpass Hell is about 3 miles round trip, making it a moderate outing. From the parking area on the main park road, the trail climbs and dips across rocky slopes, offering views of the surrounding peaks and Lake Helen, before descending into the hydrothermal basin where the boardwalks begin. Most reasonably fit visitors can complete it in a couple of hours, including time to explore the boardwalks and watch the bubbling features. Because the trail is at high elevation, snow can linger well into early summer and sometimes blocks the route, so it is important to check current trail conditions before you go. Bring water, sun protection, and sturdy shoes, and allow time to enjoy the remarkable volcanic scenery.

Bumpass Hell is safe to visit as long as you stay on the designated boardwalk and trails and follow the posted rules. The boardwalk is built to let visitors walk safely above the fragile, dangerously hot ground and view the boiling mudpots, fumaroles, and pools up close. The serious danger comes from leaving the boardwalk: the crust can be thin over boiling mud and scalding water, and stepping off has caused severe, sometimes life-threatening burns, which is exactly how the area got its name. It is essential to keep children close, never let pets off leash or off the boardwalk, and resist the urge to touch the water or get a closer photo. Treated with respect and caution, Bumpass Hell is a fascinating and safe experience.