Cold Boiling Lake Trail

Overview

Cold Boiling Lake is a short, family‑friendly walk to a quirky hydrothermal oddity: a lakeshore where cold volcanic gases percolate up as tiny bubbles. Don’t expect a cauldron—the action is often a gentle “cold simmer,” but it’s a fun, low‑effort taste of Lassen’s geothermal personality. The out‑and‑back hike is about 1.5 miles total with roughly 100 feet of gain, making it a great leg‑stretcher or kid‑friendly stop.

Route Preview

Start from the Kings Creek Picnic Area and take the trail that climbs briefly from the lot (not the path to Kings Creek Falls). Once you crest the initial rise, it’s mostly flat for roughly 0.8 miles one way to the lake. Walk a bit of the shoreline to spot the small bubbling zones; the ground can be muddy near the activity, so step carefully and keep kids close.

What You’ll See

You’re visiting a “dying” hydrothermal feature—gas still vents, but it’s subtle. Expect open views, wildflowers in season, and stretches of post‑fire landscape from the 2021 burn, which creates both stark scenery and wider sightlines. The lakeshore’s bubbling pockets are the star; think of this as a preview to the park’s bigger thermal basins.

Easy Add‑Ons and Bigger Objectives

Want a little more? Continue about 0.5 miles beyond Cold Boiling Lake to Crumbaugh Lake, where meadows are known for wildflowers and wildlife viewing. For a longer, tougher outing, carry on past Cold Boiling Lake toward Bumpass Hell. From Kings Creek, it’s roughly 5 miles round trip with about 750–980 feet of climbing. That segment is steeper, rocky in spots, with minimal shade and a tricky creek crossing—trekking poles help. At Bumpass Hell, you’ll explore the boardwalk with boiling pools, mudpots, and a strong sulfur smell. If you want the shortest access to Bumpass Hell itself, there’s a separate, shorter trail from near Lake Helen that’s more crowded.

Best Time to Hike

Snow lingers here; the highway and higher trails can remain closed into early summer, and Bumpass Hell often doesn’t open until mid‑summer. The Cold Boiling Lake walk is best from mid‑summer through fall once snow melts. Go early or late for cooler temps, softer light, and fewer people, especially if you’re continuing toward Bumpass Hell where shade is limited.

Know Before You Go

• Hydrothermal areas demand respect: stay on established trails and boardwalks—the ground can be a thin crust over scalding, acidic features.
• Expect mud near the bubbling shoreline and strong sun exposure at altitude.
• In burned forests, be mindful of unstable standing dead trees (snags), especially on windy days.
• Standard park entry fees apply; no special permit is required for day hiking.
• Check current road and trail conditions before you go; seasonal closures are common.

Overall: a mellow, worthwhile detour if you’re nearby—especially as an appetizer before the main course at Bumpass Hell.