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Grand Prismatic Spring

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  • Yellowstone
  • National Recreation Area
The Grand Prismatic Spring is 370 feet in diameter and the largest of the hot springs in Yellowstone. The center is an intense azure blue. The hot water produces algae to grow with colors ranging from orange and green to golden brown.
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Phone
307-344-7381
Mailing Address
Yellowstone National Park
PO Box 168
Yellowstone National Park, WY 82190
Season
May - September
Special direction map

The Grand Prismatic Spring is accessed by taking the Midway Geyser Basin boardwalk.