How hot are the sulfur pools in Yellowstone?

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.



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Sulphur Spring (also known as Crater Hills Geyser), is a geyser in the Hayden Valley region of Yellowstone National Park in the United States. Sulphur spring has a vent Temperature of 89 °C (192 °F) although the actual temperature of the spring is 79.8 °C (175.6 °F).

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However, Yellowstone is also an active geothermal area with hot springs emerging at ~92°C (~198°F) (the boiling point of water at Yellowstone's mean altitude) and steam vents reported as high as 135°C (275°F).

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But Yellowstone's thermal features don't flow cold water like you're used to. Don't touch any water in or around thermal features. Never swim, soak, or wade in thermal features.

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1. Norris Geyser Basin, Yellowstone. This tallest geyser in the world set the highest temperature ever recorded in the park. It's so far above sea level that the boiling point is 199°F rather than the sea-level 212°, but a hole drilled by scientists to 1,087 feet deep found a temperature of 459°F.

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Grand Prismatic Spring, Yellowstone's largest hot spring, is 200-330 feet in diameter and more than 121 feet deep. Limited parking, especially 10 am-6 pm. Located in Midway Geyser Basin.

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The Boiling River is one of only a few hot springs in Yellowstone National Park for swimming.

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Abyss Pool is one of the deepest hot springs in the park, descending 53 feet (16 m).

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The hot springs within Yellowstone are far too hot to enjoy. Even a dip of a tow could result in serious burns. Please pay attention to signage and do not touch the scalding waters of Yellowstone. There are a few places where hot waters flow into cool rivers, making a warm area to swim and soak.

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Taking a Dip The naturally high temperatures of the spring water make the water unsafe for bathing, so think twice before you dip your toes in. Fortunately, there are other options at the park that make it possible to submerse yourself in the therapeutic waters at a safe temperature.

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Water in hot springs can cause severe or fatal burns, and scalding water underlies most of the thin, breakable crust around hot springs. More than 20 people have died from burns suffered after they entered or fell into one of Yellowstone's hot springs.

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