Every Trail Tells a Story
Bumpass Hell
Safest, closest look at Lassen’s roaring volcanic heart.
Big alpine scenery plus a mini-Yellowstone payoff.
A trail every visitor can and should hike-an instant park classic.
If you hike only one trail in Lassen, make it this one. The distance is approachable, the alpine scenery a delight, and the payoff unforgettable. At trail’s end lies Bumpass Hell, the largest hydrothermal area in the park and the best place to experience the raw volcanic forces still simmering beneath your boots.
Here, the earth is alive. Steam hisses from cracks in the ground, mudpots bubble and spit like cauldrons, and colorful pools shimmer in turquoise, yellow, and white. Big Boiler, the park’s fiercest fumarole, roars at nearly 320 degrees Fahrenheit, reminding hikers that Lassen is very much an active volcanic landscape. Scientists say the whole basin is like a window into the guts of the southern Cascades.
The place gets its unusual name from Kendall Vanhook Bumpass, a cowboy and prospector who stumbled across the hydrothermal basin in the 1860s. Poor Bumpass promptly fell through a thin crust and into scalding mud, burning his leg badly. Later, while guiding a newspaper editor to the site, he fell through again. His leg was eventually amputated, and the name “Bumpass Hell” stuck as both memorial and caution. These days, a sturdy boardwalk makes sure no one shares his fate.
The trail to Bumpass Hell adds its own charm. Starting near 8,000 feet, it crosses meadows that burst with lupine, paintbrush, and mule’s ears in early summer, then fade to golden grasses in autumn. Red fir and whitebark pine flank the way, and views open wide to Lassen Peak, Brokeoff Mountain, and the ridges of ancient Mt. Tehama. In June, snowfields sometimes linger, reminding you this is alpine country.
Arriving at the basin, you’ll first hear it: the roar, hiss, and gurgle of geothermal features. Then the sulfurous tang hits your nose, volcanic “perfume” that some find pungent, others oddly invigorating. Walk the half-mile boardwalk and linger. Watch bubbles rise and burst, see rainbow-colored bacterial mats painting the runoff, and realize you’re witnessing geology in motion.
For those with time and energy, the basin is also a gateway. Trails connect to Cold Boiling Lake and Crumbaugh Lake, both quieter, scenic spots where the drama is replaced by serenity. But nothing quite compares to Bumpass Hell itself-a natural amphitheater where earth’s hidden heat comes spectacularly to the surface.
The trailhead lies along Highway 89, about six miles north of the Kohm Yah-mah-nee Visitor Center. Parking is limited on busy summer weekends, so arrive early or late in the day.
The path begins near 8,000 feet and immediately serves up alpine atmosphere-groves of red fir and whitebark pine, open meadows that in July glow with mule’s ears and lupine, and broad sky in every direction. The trail contours gently across the slope of Bumpass Mountain; footing is easy, though in early summer short snow patches may linger. Between shaded stretches, clearings reveal fine views of Lassen Peak to the north and Brokeoff Mountain to the southwest. By autumn, the meadows turn gold and the air takes on that crisp, spicy alpine tang.
About 1.5 miles from the trailhead, reach an overlook and then descend into the steaming basin. You’ll hear Bumpass Hell before you see it-the hiss and rumble of vents and the faint sulfur scent riding the wind. Step onto the stout boardwalk for a safe half-mile tour through the hydrothermal heart of the park. Big Boiler, the largest fumarole in Lassen, exhales at nearly 320°F; nearby mudpots bubble and spit, milky hot springs simmer, and tiny runnels are painted orange and yellow by heat-loving bacteria. Turquoise pools rimmed with mineral crust and patches of chalky white clay complete the otherworldly palette. Interpretive signs explain the chemistry and geology-and underscore the rule here: stay on the boardwalk. Off-trail ground is thin and treacherous, as Mr. Bumpass learned the hard way.
Linger as long as you like, then retrace your steps. The only real climb of the day is the short pull back from the basin to the ridge; from there, the gentle traverse returns you to the trailhead. If you’ve got extra energy, signed paths from the basin connect to quieter destinations like Cold Boiling Lake and Crumbaugh Lake before you head back.