Yellowstone National Park: Sulphor Caldron

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Sulphur Caldron


The Sulphur Caldron in Yellowstone National Park is one of the park’s most acid hot springs, with yellow and turbulent waters reminding one of an evil witch’s brew.

What can I see and do at the Sulphur Caldron?

  • Sulphur Caldron: The Sulphur Caldron is almost as acidic as battery acid, but is a pool of life all the same. Bacteria live within the ultra-hot waters, creating the colors you see. Temperatures in the Sulphur Caldron at Yellowstone are about 190 degrees F.
  • Mud Volcano: Mud Volcano and Dragon's Mouth Spring are located right across the road and well worth a visit.

Directions to Sulphur Caldron

The Sulphur Caldron is just north of the Mud Volcano on Grand Loop Road, about 4.5 miles north of Fishing Bridge on the Park Loop Road.


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