Castle Geyser Sign, Yellowstone National Park
June 24, 2024
This photo shows the prediction sign for Castle Geyser, one of the most famous geysers in Yellowstone National Park’s Upper Geyser Basin. Castle Geyser is renowned for its large, castle-like sinter cone and powerful eruptions that occur roughly every 10 to 14 hours.
The sign, with its classic National Park Service design, provides visitors with estimated eruption times, though the geyser can be unpredictable, as the handwritten note “may erupt between times” humorously suggests. This area, which includes other famous features like Old Faithful, is a testament to the dynamic geothermal activity that defines Yellowstone. The photo was taken near the geyser at this location in Yellowstone National Park.




