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
Grand Prismatic Spring Reviews
Do yourself a favor and if you want to see this beautiful geyser in full color take the Fairy Falls trail!!! It leads you to the backside of the geyser where you don't have the steam blowing in your f... more »
Grand Prismatic was one of the absolute highlights of the park for us during our recent visit. However, note that when the weather is cold, you can hardly see the spring pool for the steaming riding o... 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.
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