Trail

Thumb Geyser

TrailOPERATIONAL★ 4.8
Thumb Geyser at Yellowstone National Park with a crystal blue pool surrounded by mineral terraces and a wooden viewing deck.

Thumb Geyser is a short, wheelchair-friendly loop at West Thumb Geyser Basin. The route stays on a well-maintained boardwalk with minimal elevation change (roughly 50 ft total) and a 20–30 minute casual stroll, though you can linger for longer. Expect thermal features, bear and bison presence nearby, and sun exposure; carry water since there are no sources on the trail.

Quick facts

Distance Miles
0.8
Route Type
Loop
Difficulty Level
Easy Stroll
Elevation Gain Feet
50

Trail profile

Distance Miles
0.8
Route Type
Loop
Difficulty Level
Easy Stroll
Elevation Gain Feet
50
Estimated Time
20–30 minutes for casual exploration; up to 2 hours if you linger
Trail Surface
Boardwalk with some paved sections at the beginning
Trail Features
  • Vibrant hot springs
  • Mud pots
  • Dormant geysers
  • Panoramic views of Yellowstone Lake
Trail Highlights
Colorful geothermal pools along a wheelchair-friendly boardwalk with a lake backdrop

Trailhead & access

Trailhead Location
West Thumb Geyser Basin parking area, off Highway 20, north of West Thumb Junction
Parking Lot Size
Large lot with ample space, including oversize spots for campers and trailers
Parking Fill Time
Main lot can fill during peak hours (8:00 AM–6:00 PM); arrive before 8:30 AM or after 4:00 PM for best parking
Shuttle Required
0
Shuttle Details
No official park-wide shuttle. Private shuttle services and guided tours are available. A public shuttle is planned for 2026.

Permits & conditions

Permit Details
Entrance fee required for Yellowstone; pay at entrance or online
Fees
$35 standard entrance pass (valid up to seven days)
Trail Status
Open
Seasonal Closures
Winter closures; snow can keep the area impassable well into spring

Facilities & rules

Restrooms At Trailhead
1
Water Sources
None on the trail; carry sufficient water
Accessibility
Wheelchair-accessible boardwalk

Safety & strategy

Hazards
  • Thermal hazards
  • Bear and bison in the area
  • Slippery surfaces on wet boards
Hazard Details
Thin, fragile ground over boiling water; risk of burns from acidic pools; keep distance from wildlife; boards can be slick when wet
Cell Service
Cell service is spotty in Yellowstone; download offline maps before you go.
Crowd Level
Very crowded during peak summer hours; visit early morning or shoulder seasons for quieter experience
Peak Crowd Times
8 am–6 pm during peak season; avoid by visiting early morning or late afternoon
Best Season
Late May through mid-October
Best Time To Visit
Late May through mid-October; start before 8:00 AM or after 4:00 PM to dodge crowds.
Tips Advice
  • Carry at least 2 liters of water.
  • Wear waterproof shoes; boardwalk can be slick when wet.
  • Wear a hat and sunscreen; sun exposure is common.
  • Bring rain gear; weather can shift quickly.
  • Traction devices may help in late-season ice.

More details

Park Area
Yellowstone National Park, West Thumb area
Trail Markers
Well-marked
Dogs Allowed
No
Biking Allowed
No
Shade Level
Partial shade; some sections exposed to sun
Map Recommended
0
Snow Dates
Winter closures; snow can persist into spring
Mud Season
Spring can bring wet conditions
Wildflower Peak
July
Fall Colors Peak
Mid-October
Bug Season
Mosquitoes can be present
Insider Tips
  • Hike clockwise for potentially better initial views.
  • Aim for early morning or late afternoon to avoid crowds and possibly spot wildlife.
Recent Updates
Boardwalk maintenance completed in 2024; minor seasonal closures may occur during shoulder seasons
Family Friendly Notes
Very safe and suitable for children due to the boardwalk and short distance
Nearby Facilities
Vault toilet at trailhead; large parking area; no restrooms on the trail
Review Summary
Hikers praise the geothermal pools and lake backdrop, accessibility, and family-friendly nature. Crowds can be heavy; the path feels like a scenic stroll rather than a backcountry trek.

Location

Thumb Geyser at Yellowstone National Park sits on a white travertine plain with steam near a forested shore.Thumb Geyser boardwalk along a lakeside trail in Yellowstone National Park.Thumb Geyser at Yellowstone National Park bursts steam from mineral pools along a rocky shoreline.Thumb Geyser overlook shows orange microbial mats and mineral crust spreading toward a blue Yellowstone lake in the distance.

Frequently asked questions

Are there bears in the area?

Yes. Maintain distance and make noise; stay on the boardwalk.

Is the trail wheelchair accessible?

Yes. The boardwalk is designed for accessibility.

Do I need a special permit?

No, but you must pay the Yellowstone entrance fee.

Is there a shuttle?

No park-wide shuttle; private shuttles available; public shuttle planned for 2026.

Is there a restroom along the trail?

Restrooms are at the trailhead vault; there are no facilities on the boardwalk.

Brink of Lower Falls

0.7 miles out-and-back. Steep climb back. The brink of Lower Falls rewards the grit.

Sources

Information is compiled from official sources, verified traveler reviews, and editorial research. Learn how YourNPGuide works.

Last updated January 2026. Report an issue.