Sulphur Springs
Sulphur Spring, also known as Crater Hills Geyser, reaches 194°F in Yellowstone's Hayden Valley at 7,805 feet elevation, requiring a 1.4-kilometer walk from the Grand Loop Road. The feature functions as both spring and geyser with documented vent temperatures of 192°F, running 160 degrees above the ambient air temperature.
Located in the Crater Hills area of Hayden Valley, the spring sits in open sagebrush and grassland roughly one mile west of the Grand Loop Road. The valley floor provides expansive views of surrounding mountains and serves as prime wildlife habitat for bison, elk, and grizzly bears. Thermal runoff creates mineral-stained channels through the valley grasses, and the elevation supports a climate with 126 inches of annual snowfall and 26 inches of precipitation.
The Crater Hills thermal area has been documented since early Yellowstone explorations in the 1870s. The sulfur name reflects the chemical signature common to many Yellowstone thermal features. The area remains undeveloped under National Park Service management, with the spring functioning in its natural geothermal cycle as it has for thousands of years.
Access requires a cross-country walk through bear habitat; carry bear spray and make noise. Summer and early fall offer the best conditions when valley grasses are dry and wildlife viewing is excellent. The spring sits in an area without maintained trails, so strong navigation skills are essential. Check with park rangers about current bear activity before venturing into Hayden Valley backcountry.
Is Sulphur Springs worth visiting?
Best for
- Observing powerful hot springs
- Overnight camping trips
- Winter soaking with dramatic temperature contrast
Not ideal for
- Casual soaking
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