About The facility, the closest hot spring to Yellowstone National Park, will have a 3,750-square-foot pool, with an average temperature of 102 degrees Fahrenheit. A hot plunge will be 104 degrees, while a cold plunge will be 70 degrees.
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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.
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.
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.
At only 45 feet (14 m) inside Old Faithful's throat, the water temperature is 244°F (117°C). Prior to an eruption, the water at the geyser's vent is 204°F (96°C)—several degrees hotter than the area's normal surface boiling point of 199°F (93°C).
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.
Taking a DipThe 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.
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.
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.