When you go to see Grand Geyser in the Upper Geyser Basin of Yellowstone, don’t be fooled by appearances. This geyser erupts from a rimless pool of water that looks more like a hot spring rather than a more common sinter cone. This pool of surface plumbing causes many people confuse Grand with the cone of neighboring Turban Geyser.
As a fountain geyser, Grand Geyser is different. Instead of shooting a ribbon of water in the air, the geyser sprays in multiple directions. It also erupts in several explosive bursts.
Although Grand is not the tallest geyser in the world (that’s Steamboat in Norris Geyser Basin), it does hold a record. It is the world’s tallest predictable geyser. Some bursts shoot up to 200 feet.
For predictions for Grand Geyser’s next eruption, stop at Old Faithful Visitor Education Center. You can also consult the Yellowstone Geyser app. Eruptions, which last around 10 minutes, occur every 7-15 hours and frequently 7-8 hours apart. At the end of the eruption, don’t walk away if the geyser seems to quit. Often, a larger second burst can follow.
Nearby, smaller Vent and Turban Geysers will usually erupt at the same time. They also continue spouting water for an hour after Grand Geyser finishes. Then, Turban returns to its common behavior of squirting every 20 minutes.
Find Grand Geyser by following the boardwalk maps in the Upper Geyser Basin. It sits across the river north of Castle Geyser.