How hot is the hottest pool in Yellowstone?

The hottest springs in the deepest part of the lake, at 125 m (410 ft) below the water, have a temperature of 174 °C (345 °F). Hot springs in the ocean are even deeper and under more water pressure and, therefore, they have temperatures of up to 400 °C (750 °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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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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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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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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Swimming is only permitted during designated hours. The Firehole Swim area is closed at night. Bathing suits are required. No food, drink, or alcohol allowed.

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The Abyss Pool has a depth of up to 53 feet, according to the National Park Service. It has a temperature of approximately 140 degrees Fahrenheit. Water in these hot springs can “severely burn” visitors, the service warns on its website.

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Yellowstone National Park isn't exactly known for its swimming holes. Due to the thermal activity in the park, most rivers and lakes in Yellowstone are closed to swimmers. However, if you're up for an adventure, the park has opened up a few alluring areas to the public.

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Conventionally, many onsen providers heat up the water or add cold water to adjust the temperature to approx. 41°C (105.8°F) which is the average temperature of Japanese bath.

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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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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. More than 20 people have died from intentionally entering or falling into hot springs.

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