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.
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Grand Prismatic Spring reviews
After hiking the .8 mile trail from the parking lot we were treated to one of the most amazing sights you will ever see. Take your time on the way up and enjoy, its everything you see in the... more »
This is one of those places that you see pictures of and wonder if someone photoshopped the colors. Trust me, they didn't. It is even more extraordinary in person! Be sure to walk to the overlook..... 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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