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.

  • See the boiling caldron that is the Sulphur Caldron within Yellowstone.
  • The most acidic pool in Yellowstone National Park.
  • Close to Yellowstone Lake with services available at Grant Village, West Thumb, Bridge Bay and Fishing Bridge.
  • Use the nearby campgrounds so you can visit the Caldron and other sights.

Overview

Yellowstone’s Sulphur Caldron is a geothermal feature that broils with acid waters and bubbling mud.

Directions to Sulphur Caldron

The Sulphur Caldron is just north of the Mud Volcano on Grand Loop Road, 9 ½ miles south of Canyon and 4 ½ miles north of Fishing Bridge.

Best Seasons to Visit

Spring, summer and fall are probably the best seasons to visit Yellowstone and the Sulphur Caldron. Winters often are very cold, and some roads close due to snow at certain times during the winter months.

What You’ll See at 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.

From the overlook, you can also see Turbulent Pool and the crater of a large mud pot. Of course, Sulphur Caldron itself is quite a sight, with the moon-like surface and hissing steam.

Temperatures in the Sulphur Caldron at Yellowstone are about 190 degrees F. Much too hot to even attempt to dip a toe in! The park rules won’t allow this at any rate. You should stay on the boardwalk.

You can find out more before your visit by checking the reports at the Ranger Naturalist Office next to the Fishing Bridge Visitor Center.

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