How Often Does Old Faithful Erupt?


Quick Answer

Old Faithful erupts at varying intervals from 60 to 110 minutes in length. The Yellowstone National Park staff offers predictions based on past activity; this is so that visitors can plan a visit to the geyser area during an eruption, which lasts between one-and-a-half minutes and five minutes.

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How Often Does Old Faithful Erupt?
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Full Answer

The predictions of the park staff are 90 percent accurate, which is how the geyser got its name. Old Faithful is a cone geyser that launches 3,700 to 8,400 gallons of boiling water from heights of 106 to 184 feet. Yellowstone National Park is a hotbed of geyser activity, with 425 active geysers at any one time.

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