West Thumb Geyser Basin Boardwalk

Overview

Set right on the shore of a vast, cold lake, this is one of Yellowstone’s easiest wins. The boardwalk strings together two connected loops through a compact hydrothermal wonderland: an inner loop (~0.25 mile) and an outer loop (~0.5 mile). Walk one or both; with connectors and short spurs, most visits land around 0.75–1.0 mile total. Expect minimal effort (about 62 feet of gain) for maximum scenery.

What you’ll see

West Thumb sits inside a smaller volcanic caldera that blasted out roughly 174,000 years ago—nested within the much larger Yellowstone Caldera. That backstory explains why the shoreline bubbles: hot springs, mud pots, and the occasional lakeshore geyser punctuate the route. On calm days you can even spot patterns on the lake surface from underwater vents just offshore.

Color is the showstopper. Thermophile mats paint the edges red, orange, yellow, and green, while the hottest pools turn a clear, near-boiling blue. Don’t miss Abyss Pool—famously deep and ultramarine—and the storied Fishing Cone, where early visitors once tried to “catch-and-cook” on their hooks (that’s illegal now, for good reason). You’ll also pass features like Twin Geysers and other intermittent lakeside vents that remind you this ground is alive.

Accessibility

This boardwalk is one of the park’s most wheelchair-friendly walks: wide (about 8 feet with passing spaces), with edge barriers or railings, mostly gentle grades, and benches along the way. There is a short section on the north side between Twin Geysers and Abyss Pool that reaches about a 10% grade. Designated accessible parking is in the paved lot at the trailhead.

Best time to walk

You can stroll it quickly in about 20–30 minutes, but give yourself time to linger—steam looks especially dramatic in cool morning air, and late-day light over the lake is gorgeous. Crowds are heaviest mid-day; go early or near sunset for a quieter loop and better photos. Peak season is May–October. Even in summer, the lakeside air can feel cool (the lake averages around 45°F), so bring a layer.

Tips

• Do both loops if you can—start on the outer loop for big lake panoramas, then cut through the inner to hit the headline pools.
• Restrooms are at the end of the parking lot. A historic log ranger station by the lot serves as a seasonal info/warming spot.
• Absolutely stay on the boardwalks. The ground is thin and water can be near or above boiling. Supervise kids closely.
• Pets aren’t allowed on boardwalks or in thermal areas; trained service animals are permitted.

Nearby add‑ons

From the same parking area, add the short Duck Lake stroll (~0.8 miles round trip) or climb the Lake Overlook (~2 miles round trip, ~250 feet gain) for a broader panorama of the basin and lake.