Trail

West Thumb Geyser Basin Trail

Trail
A turquoise hot spring pool surrounded by a boardwalk sits above a large lake.

A 0.6-mile boardwalk loop through geysers and hot springs on Yellowstone Lake's shore—easy terrain, zero climbing, perfect for families and time-crunched visitors. You'll see colorful thermal features, dormant lakeshore geysers, and expansive lake views from a safe, paved path. The walk takes 30-45 minutes if you move through; add an hour if you stop at every thermal feature. Thermal water exceeds 200°F and causes severe burns—stay on the boardwalk.

Quick facts

Distance Miles
0.6
Route Type
Loop
Difficulty Level
Easy
Elevation Gain Feet
0

Trail profile

Distance Miles
0.6
Route Type
Loop
Difficulty Level
Easy
Elevation Gain Feet
0
Estimated Time
30-45 minutes if moving through; 1-2 hours with stops for thermal features and photography.
Trail Surface
Paved boardwalk
Trail Features
  • Colorful hot springs
  • Dormant lakeshore geysers
  • Yellowstone Lake shoreline views
  • Thermal features and geothermal pools
Trail Highlights
Colorful thermal features and expansive Yellowstone Lake views from a safe, accessible boardwalk. The boardwalk passes through one of the park's most active geyser basins without technical climbing or exposure.

Trailhead & access

Trailhead Location
West Thumb Geyser Basin Parking Area
Parking Fill Time
Full by 8:00 AM mid-June through August; 9:00 AM in shoulder seasons.
Shuttle Required
0
Shuttle Details
No shuttle required. Drive directly to the West Thumb Geyser Basin Parking Area trailhead. Overflow parking is limited; arrive early during peak season.

Permits & conditions

Permit Details
No permits required for day hiking.
Fees
No trail-specific fee. Yellowstone park entrance: $35/private vehicle (7-day pass). Hikers on foot: $20.
Trail Status
Typically open June through September; closed October-May due to snow and ice.
Seasonal Closures
Closed typically November through May. Road access and trail conditions vary by year; check NPS.gov before visiting in shoulder seasons (May-June, September-October).

Facilities & rules

Restrooms At Trailhead
0
Water Sources
Bring your own water; the trail offers no water sources. Yellowstone Lake is not safe to drink untreated. Fill up at the visitor center or lodging before starting.
Accessibility
Fully accessible boardwalk with two loops: outer loop (½-mile) and inner loop (¼-mile). Designated accessible parking available at the trailhead. Paved surfaces accommodate wheelchairs and mobility devices.

Safety & strategy

Hazards
  • Thermal water hazards—boiling springs and geysers
  • Slippery boardwalk surfaces (thermal runoff)
  • High UV exposure from lake reflection
  • Crowding near thermal features
  • Dehydration on short exposures
Hazard Details
Thermal features exceed 200°F and cause severe burns if you step off the boardwalk. Boardwalk surfaces are slippery when wet from geyser spray and thermal steam—good footwear is essential. Reflection off Yellowstone Lake intensifies UV exposure; sunburn happens fast here. Crowding at peak hours can create congestion and safety issues around thermal features.
Cell Service
Limited. Expect spotty to no cell service in the West Thumb area. Carry a satellite communicator or offline maps for emergencies.
Crowd Level
Moderate to heavy during mid-day and July-August peak season. Early morning (before 8 AM) and late afternoon (after 4 PM) offer relative solitude.
Peak Crowd Times
10 AM to 3 PM daily. July-August peak season (avoid mid-day). Weekends busier than weekdays.
Best Season
Summer and Fall (June-September)
Best Time To Visit
June through September when park roads are open and thermal features are fully active. Arrive by 7:30 AM to avoid tour-group congestion; the lot fills by mid-morning during peak season (July-August).
Tips Advice
  • Stay on the boardwalk—thermal features exceed boiling temperature and cause severe burns.
  • Bring at least 1L water even though it's short; thermal features and full sun exposure dehydrate faster than you expect.
  • Wear high-SPF sunscreen and a hat—reflection off the lake intensifies UV exposure.
  • Avoid peak hours (10am-3pm) by going at dawn or late afternoon.
  • Wear shoes with good grip; boardwalk surfaces are slippery when wet from thermal steam.
  • Tighten your boots before you go; the walk is easy but footing matters on damp surfaces.

More details

Park Area
West Thumb
Trail Markers
Well-marked boardwalk loop. Impossible to get lost. Both loops clearly signed (outer loop ½-mile, inner loop ¼-mile).
Dogs Allowed
No. Pets are not permitted on this trail.
Shade Level
Full sun exposure over water. Thermal features provide intermittent steam cover. Hat and sunscreen are non-negotiable.
Emergency Contacts
Yellowstone National Park Ranger: 307-344-2876. Nearest ranger station: Grant Village (approximately 20 miles). In emergency, use satellite communicator or signal for help at the trailhead.
Map Recommended
0
Snow Dates
Typically closed by late October; snow and ice prevent safe travel November through May.
Mud Season
April-May as snowmelt and thermal runoff create wet, slippery boardwalk conditions. Spring is the muddiest season.
Fall Colors Peak
Late September through early October
Bug Season
Peak mosquito activity July-August. Bring insect repellent if hiking during summer evenings.
Insider Tips
  • The outer loop at sunrise offers solitude and the best thermal colors before crowds arrive.
  • The inner loop is a 15-minute warm-up if time is tight.
  • Thermal geysers are most visibly active in cooler hours (dawn and dusk)—colors are vivid in low light.
  • Photograph from the northwestern boardwalk section for the best framing of thermal features against the lake.
  • Avoid the peak lunch hour (12-1 PM) if you dislike crowds.
Recent Updates
Trail conditions vary seasonally; thermal features can change activity levels. Check NPS.gov/yell for real-time trail status and road openings before visiting, especially in shoulder seasons.
Family Friendly Notes
Excellent for families with young children. Thermal features attract kids but demand close supervision—thermal water causes severe burns. Keep children on the boardwalk at all times. The short distance and flat terrain make it ideal for toddlers and older adults. Stroller-friendly paved boardwalk.
Nearby Facilities
Grant Village (approximately 20 miles): supplies, lodging, gas station. West Thumb Visitor Center near trailhead. No direct amenities at the trailhead; arrive prepared with water and food.
Review Summary
Visitors consistently praise this trail for accessibility and thermal features without technical hiking. Families and time-crunched travelers find it rewarding. Most complaints center on crowding during peak hours, not the trail itself. Early-morning visits yield the best experience and solitude.

Frequently asked questions

Is this safe for young children?

Yes, with supervision. Thermal features pose a severe burn risk if children wander off the boardwalk. Keep them close and reiterate the danger repeatedly—thermal water is hotter than boiling.

How long does it really take?

30-45 minutes if you move through steadily. 1-2 hours if you stop at every thermal feature and take photographs. The outer loop is longer; the inner loop takes 15 minutes.

Can I do this if I'm out of shape?

Absolutely. This is a flat, paved boardwalk with no climbing, stairs, or elevation gain. Fitness is not a factor here.

Do I need special hiking boots?

No. Regular shoes with good grip work fine. Avoid sandals or slippery-soled shoes—boardwalk surfaces are slippery when wet from thermal steam.

Are there bears on this trail?

Bears are present in Yellowstone but rarely encounter crowds on this heavily-trafficked boardwalk. Make noise while walking; if you see a bear, back away slowly and give it 25+ yards of space.

Is the thermal water drinkable?

Absolutely not. Thermal features are heavily mineralized and unsafe to drink. Carry your own water or fill up at the visitor center before starting.

Brink of Lower Falls

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

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Sources

Editorial review: YourNPGuide Editorial Team. Information is compiled from official sources, verified traveler reviews, and editorial research; no firsthand visit is implied unless explicitly documented. Learn how YourNPGuide works.

Last updated June 2026. Report an issue.