At nearly 113 m (370 ft) across and 37 m (121 ft) deep, Grand Prismatic Spring holds the title of the largest hot spring in America and one of the largest in the world. A premier attraction at Yellowstone National Park, the spring's fame traces back to early explorers and fur trappers who first noted it in the early 1800s. The boiling pool constantly steams and bubbles, with its vivid, rainbow-like appearance--the result of pigmented bacteria. To get a close-up view, walk along the park's boardwalk, which leads to a route close to the water's edge. Stay on the path, as the high temperatures of the pool can be dangerous. Plan to visit Grand Prismatic Spring and other customer-reviewed, writer-recommended Yellowstone National Park attractions using our Yellowstone National Park travel route app.
Tours to Grand Prismatic Spring
$414 BOOK WITH VIATOR Yellowstone Private Guided Day Hike: Geyser Wonderland / Fairly Falls Trail
Duration: 6 hours
$1,450 BOOK WITH VIATOR Private Yellowstone Geology Tour with Wildlife, Hiking, and Geysers and Lunch
Duration: 5 hours 30 minutes
Grand Prismatic Spring reviews
Somehow in my previous 3 trips, I had never been here. On this trip, we hiked the lower trail next to the spring and realized that was not the best view. We could see people on a trail up above... more »
This is the granddaddy of the springs. The rainbow colored giant spring was beautiful to behold. So much that we came back for a second look on the last day of the trip, and encountered a... more »
Amazing place! One of the world’s largest and deepest hot springs. Beautiful!
There is a hike to a top overlook that is highly recommend. Wonderful colors. Amazing.
Plan your trip to Yellowstone National Park
Get a personalized tripA complete day by day itinerary
based on your preferences
Customize itRefine your trip. We'll find the
best routes and schedules
Book itChoose from the best hotels
and activities. Up to 50% off
Manage itEverything in one place.
Everyone on the same page.
Popular things to do in Yellowstone National Park
Nature in Yellowstone National Park
Hidden gems in Yellowstone National Park
Side trips from Yellowstone National Park
Trails in Yellowstone National Park
Trips to Grand Prismatic Spring by other users
18 days in Western US BY A USER FROM UNITED STATES Grand Teton National Park Yellowstone National Park Seattle 30 days in Yellowstone National Park & Grand Canyon National Park BY A USER FROM UNITED STATES Yellowstone National Park Grand Canyon National Park 7 days in Rapid City & Jackson Hole BY A USER FROM UNITED STATES Rapid City Jackson Hole 16 days in United States BY A USER FROM UNITED KINGDOM New York City Yellowstone National Park San Francisco 8 days in Western US BY A USER FROM UNITED STATES Yellowstone National Park Grand Teton National Park Yosemite National Park 4 days in Yellowstone National Park BY A USER FROM UNITED STATES Blue Star Spring Old Faithful Historic Yellow Bus Tour