Overview
The Grand Prismatic Spring is the largest hot spring in the United States and the third-largest in the world. It is renowned for its vibrant colors, which are the result of various thermophilic bacteria that thrive in the hot waters.
The Grand Prismatic Spring is a key feature of Yellowstone National Park and a major attraction due to its unique geological and biological characteristics.
Location
Address
Midway Geyser Basin, Yellowstone National Park, Wyoming
Neighborhood: Midway Geyser Basin
Coordinates
44.597200, -110.804200
Visiting Information
Opening Hours
Admission
Best Time to Visit
Overall Best Period
May-September
Best Time of Day
Early morning
fewer crowds and better lighting for photos
Duration Recommendations
Seasonal Highlights
spring
mild to cool
- • spring wildflowers
- • meltwater streams
summer
warm to hot
- • vibrant spring colors
- • extended daylight
autumn
cool
- • fall colors
- • cooler temperatures
winter
cold
- • snow-covered landscapes
- • wildlife tracking
Know Before You Go
Essential Information
- Check park alerts
- Bring bear spray
- Stay on designated paths
What to Bring
essential
recommended
seasonal
not allowed
Health & Safety
Physical Requirements: easy to moderate
- • hot springs are dangerous
- • wildlife encounters
Medical facilities: nearest medical center in Mammoth Hot Springs
Payment Information
Accepted
cash, cards
Currency
USD
Typical Costs
Dress Code
casual, comfortable, layers, sun protection, hiking shoes, inappropriate clothing, flip-flops
Booking Tips
- • not required, but recommended for lodging
- • official Yellowstone National Park website
- • varies by service
- • early arrival
Amenities
Digital Services
Mobile App
Yellowstone National Park
Size: 100 MB
Features: Map, Park alerts, Events
Platforms: iOS, Android
WiFi Zones: Visitor centers
Charging Stations: Visitor centers
How to Reach
From Airport
Nearest: Yellowstone Regional Airport (COD)
Distance: 90 km
Travel Time: 1.5 hours
From City Center
Distance: Not applicable
Local Insights
Cultural Context
Why Locals Love It: Unique natural beauty, rich wildlife
Historical Significance: First national park in the world
Insider Tips
- Best views from the Grand Prismatic Spring overlook
- Early morning visits are less crowded
Local Recommendations
- • Visit Old Faithful
- • Explore Grand Canyon of the Yellowstone
Language Help
Useful Phrases
Guide Languages: English, Spanish
Photography Guide
Best Photo Spots
Grand Prismatic Spring Overlook
Best Time: Golden hour
Tips: Wide angle for full view
Result: Iconic shot of the spring
Photography Rules
Nearby Attractions
Old Faithful
Distance: 1km
Walking: 15 min
Type: Geyser
Grand Canyon of the Yellowstone
Distance: 30km
Walking: Not walkable
Type: Canyon
Reviews
Based on 5,000 reviews
Recent Visitor Tips
- "Arrive early"
- "Bring layers"
- "Visit all overlooks"
Contact Information
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Available Tours
102
Rating
4.8 / 5.0
Reviews
5,000
Adult Entry
$35 (park entry)