How often does Old Faithful erupt?

The world's most famous geyser, Old Faithful in Yellowstone, currently erupts around 20 times a day. These eruptions are predicted with a 90 percent confidence rate, within a 10 minute variation, based on the duration and height of the previous eruption.



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A 19-year-old was badly burned from an iconic geyser in Yellowstone National Park, officials said. Park rangers helped the woman at Old Faithful on Thursday. She had second- and third-degree burns over 5% of her body, park rangers said.

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The mornings (dawn until 11 a.m.) and evenings (6 p.m. until dusk) are perfect window times for beating the tour groups and family wagons and securing a spot with an uninterrupted view. If you prefer the morning, all you need is a trusty alarm clock, maybe a strong cup of coffee and an early start to the day.

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Does it cost money to see Old Faithful? No, but Yellowstone does require a $35 entrance fee that's valid for 7 days. The pass allows you to view all attractions within the park, including Old Faithful.

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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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As pressure is released, gases dissolved in the magma come out of solution, turning the magma into a boiling froth. The total energy released would be equivalent to an 875,000 megaton explosion. The shockwave would kill 90,000 people. Most of the lava would fall back into the crater.

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If heat could be bled off of the magma chambers, cooling and solidifying them, not only would that (theoretically) stop the volcano from erupting, but the heat could be used to generate electric power with a geothermal energy plant.

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This may have been a bit of an exaggeration, but geysers do emit a bit of a stench due to the elevated levels of sulfuric acid and hydrogen sulfide gas contained within the geysers themselves.

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Old Faithful Geyser expels 3,700 to 8,400 gallons of water each time it erupts. During eruptions, the water in Old Faithful shoots from 106 to more than 180 feet (32-55 m) high.

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Old Faithful Geyser in Winter There is something extra special about seeing Old Faithful geyser erupt in winter. If you time it right, you may be the only person there. The geyser's reliable timetable persists through winter, with eruptions creating a mesmerizing contrast against the snowy surroundings.

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Just like the animals in the park, the geyser basins won't stop with the weather. Geyser basins are a never-ending wonder, even in the rain; Old Faithful will still spectacularly erupt and hot springs will still be vibrant despite weather conditions.

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