One of the most iconic features in Yellowstone’s Upper Geyser Basin, Castle Geyser rises proudly across the Firehole River near Old Faithful. With its towering cone, dramatic eruptions, and ancient geological structure, Castle Geyser is a must-see stop along the park’s geyser boardwalks.
Recommended For
Geology Enthusiasts: Witness thousands of years of natural buildup through Castle’s massive silica cone.
Photographers: Capture the spectacular steam and water eruptions that reach up to 75 feet high.
Park Explorers: Stroll the scenic boardwalk from Old Faithful to discover Castle and nearby hot springs.
What to Expect
- Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
- Access: Located along the boardwalk route from Old Faithful to Chromatic and Beauty Pools
- Nearby Features: Firehole River, Old Faithful, and other geysers in the Upper Basin
- Vibe: Majestic and awe-inspiring—a powerful display of Earth’s geothermal forces
Geological Highlights
- Ancient Cone: Formed by centuries of silica-rich water deposits, Castle’s cone is one of the oldest in the park
- Massive Eruptions: Geyser eruptions reach up to 75 feet and last about 20 minutes
- Eruption Cycle: Erupts roughly every 11 to 13 hours—typically twice a day
- Historic Activity: Older than Old Faithful, Castle Geyser shows how geysers evolve over thousands of years
Environmental Impact
- Flooding Effect: Each eruption sends silica-rich water across the area, shaping and altering the landscape
- Mineral Deposition: Constant flow of hot water adds to the cone's growth and nearby geothermal features
Visitor Tips
- Check Geyser Predictions: Stop by the Old Faithful Visitor Education Center for the latest eruption times
- Wear Comfortable Shoes: The boardwalk offers scenic walks but can get hot or slippery
- Stay Behind Barriers: Geyser areas are fragile and dangerous—observe from designated paths
Contact & Map
Yellowstone National Park
P.O. Box 168, Yellowstone National Park, WY 82190
Park Info: (307) 344-7381
www.nps.gov/yell
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