Geysers Galore!

Yellowstone National Park

Visitors along a boardwalk watch Beehive Geyser erupt
Duration Multiple Days
Topic(s) Geology, Geothermal, Geysers
Activities Self-Guided Tours - Walking
Type Kid Friendly, Active, Educational, Inspirational
Parks Yellowstone National Park

Simultaneous eruptions of Beehive and Lion Group Geysers
Beehive and Lion Group Geysers

National Park Service

Yellowstone National Park preserves the most extraordinary collection of hot springs, geysers, mudpots, fumaroles, and travertine terraces on Earth. More than 10,000 hydrothermal features are found here, of which more than 500 are geysers.

Microorganisms called thermophiles, or heat lovers, make their homes in the hydrothermal features of Yellowstone. Although individually they are too small to be seen with the naked eye, so many are grouped together in the park's hydrothermal features—trillions!—that they often appear as masses of color. Many of these microorganisms are also called extremophiles because they inhabit environments that are extreme to human life. Imagine living in near-boiling temperatures, in hydrothermal features with the alkalinity of baking soda, or in water so acidic that it can burn holes in clothing; microorganisms in Yellowstone not only exist in such conditions, but require these extremes to thrive.
Upper Geyser Basin
  • Yellowstone National Park

    Watch Old Faithful Geyser Erupt

    • Activity Fee: No (Entrance fees may apply)
    • Reservations: No
    • Activity: Self-Guided Tours - Walking
    • Pets: No
    • Location: Upper Geyser Basin
    • Duration: 30–90 Minutes
    • Season: Winter, Spring, Summer, Fall
    • Time of Day: Any Time
    Old Faithful Geyser erupting, sending steam and water up into the air

    Old Faithful Geyser is the world's best known geyser. Its eruption intervals have varied from 40 to 126 minutes. Find out the eruption times of Old Faithful and other large geysers at the Old Faithful Visitor Education Center, following the @GeyserNPS twitter feed, or using the Geysers app.

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Last updated: October 26, 2017