Faithful and also true: The guide to the town hall Old Faithful and also other Yellowstone geysers

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Old Faithful is the most famed geyser in Yellowstone nationwide Park, although it is neither the tallest that the park"s 500 geysers no one the most regular. Even though it doesn"t erupt at precise hourly intervals, that sprays right into the air more frequently than any kind of other park geyser, getting to heights of up to 184 feet.

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How frequently does Old Faithful erupt?

Old Faithful erupts, ~ above average, about 17 time daily. Even though the doesn"t monitor a strict timetable, the geyser is unique in the its eruptions have the right to be predicted within 10 minutes 90 percent of the time. The time between eruptions different from 60 come 110 minutes. If Old Faithful erupts for less than 2.5 minutes, the next occasion will it is in in approximately 68 minutes; if that lasts more than 2.5 minutes, there will be an approximate 94-minute interval prior to the next eruption. The geyser is influenced by pressure structure up in a reservoir listed below the earth and also is unaffected through the weather and also seasons above the earth"s crust, making the a reputable year-round event.

Beat the crowds

With guess of eruptions specific within 10 minutes, summer crowds gather quickly in Old Faithful"s viewing areas. A limited amount of benches in the park"s five viewing areas fill increase quickly, however a horseshoe-shaped walkway method you"ll usually obtain to watch the eruption just by walking additional down the trail and standing follow me the rail.


If you don"t desire to be shoulder come shoulder with various other summer tourists, plan to view the geyser between dawn and 11 a.m. Or in between 6 p.m. And also dusk. Stay at Yellowstone Inn or Yellowstone Lodge come be less than a half-mile walk native the geyser. Walk in the off-season to suffer a true winter wonderland. Continue to be at the Old Faithful snow Lodge between December and also March to have actually easy accessibility to the geyser basin and experience the park ~ above snowshoe, cross-country skis or snowcoach.

There"s an application for that!

Whether you have actually an iphone phone or Android device, you deserve to download the park"s Geysers application to acquire notifications as soon as Old Faithful"s eruption window is around to begin. The app notifies you 10 minute ahead the time, providing you lot of of time come walk from nearby lodges to see the event. The Geysers app also has prediction times and also notifications for various other geysers in the park to aid you do the many of her geyser viewing in the park.

Grand: The eruption home window for this fountain geyser is plus or minus 90 minutes. The puts on a good show lasting because that 8 come 12 minutes and shooting up to 200 feet high, making the the tallest predictable geyser in the world. Two surrounding geysers, Vent and also Turban, room connected and erupt nearly in unison with Grand. The time in between eruptions averages 6 hours and also 45 minutes.

Castle: This 75-foot geyser erupts only every 13.5 hrs or so. Once it does, the 60- to 90-foot fractional lasts because that 15 come 20 minutes. Castle isn"t constantly predictable. Boy eruptions of 11 minutes signal violent splashing the lasts for hours without developing into a significant eruption. It won"t be predictable again till its next major eruption happens.

Great Fountain spurts as much as 220 feet high because that an hour or two at a time. The geyser erupts every 9 to 15 hours and is calm between eruptions. Just before an eruption, water starts bubbling out of the geyser"s vent v violent bubbling around 3 feet tall. The pool then goes silent, and also a huge bubble might kind over it prior to the dramatic explode of water. The geyser is 10 mile from Old Faithful, and also its eruptions are predicted indigenous Memorial Day with September.

Daisy is a cone geyser that sprays turn off at one angle about 75 feet into the air. The unique display lasts just 3.5 minutes, yet you can record it every 150 come 200 minutes through an eruption home window of add to or minus 30 minutes.

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Riverside is predictable in ~ 30 minutes. It"s 75-foot plume sprays for about 20 minutes. After an eruption, the takes the geyser 5.5 come 7 hrs to rebuild pressure prior to the next one. You have the right to tell once an eruption is imminent. About 2 hours prior to it spews, water overflows native its reduced vent right into the river. After one more hour, water bubbles the end of its top vent. Once the bubbling water native the upper vent spurts right into the river, one eruption begins.