Sulphur Caldron
Sulphur Caldron boils at 190°F just 31 meters from the Grand Loop Road in Yellowstone National Park, making it one of the park's most accessible superheated features. At 7,728 feet elevation, the caldron runs 156 degrees above the ambient temperature of 34°F in this permanently protected National Park Service wilderness.
The caldron sits in Gallatin County's harsh high-elevation terrain where annual snowfall reaches 125 inches and precipitation totals 26 inches yearly. The immediate landscape consists of thermal ground with acidic runoff channels carved through mineral deposits, surrounded by lodgepole pine forest characteristic of Yellowstone's plateau. The Grand Loop Road provides the dominant human element in an otherwise wild setting dominated by geothermal activity and severe alpine weather patterns.
The name references the sulfurous compounds that give the feature its distinctive chemistry and acrid smell. The caldron has been a documented Yellowstone thermal feature since the park's establishment in 1872, accessible to visitors via the Grand Loop Road system developed in the early 20th century. It remains in natural condition under National Park Service stewardship.
Visit between June and September when the Grand Loop Road is reliably open; winter access requires snowcoaches or skis. The caldron is visible directly from a roadside pullout, requiring no hiking. Expect cold temperatures even in summer at this elevation. Combine with nearby Mud Volcano area features. Stay on boardwalks; thermal ground is unstable and dangerous.
Is Sulphur Caldron worth visiting?
Best for
- Observing powerful hot springs
- Easy day trips
- Overnight camping trips
- Winter soaking with dramatic temperature contrast
Not ideal for
- Casual soaking
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