Castle Geyser


The magnificent cone of Castle Geyser is thousands of years old and rests upon even older platforms. Together, they form one of the largest, and oldest, sinter formations in the world. Its eruption pattern has changed considerably throughout its recorded history. Castle is currently erupting about every 10 - 12 hours. A water eruption frequently reaches 90 feet (27m) and lasts about 20 minutes. The water phase is followed by a noisy steam phase lasting 30 - 40 minutes.

*Adapted from the NPS Old Faithful Area Trail Guide and the NPS Old Faithful Area Interactive Map

Feature Type


Inventory ID

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Latitude: 44.46344
Longitude: -110.8367
Survey Date: No survey date provided

Geographic Area: Firehole River Drainage
Thermal Region: Upper Geyser Basin
Thermal Complex: Castle Group
Ranger District Contact: Old Faithful District, Colleen Rawlings (307) 344-2701

Feature Data

Data Source Supplied By Sample Date Temp Vent Temp pH Cond Extended Data
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