File:M 3812210 se 10 060 20220521.tif — public domain
Sulphur Creek flows at 120 degrees in Lake County near Cobb at 2,039 feet elevation in the forested Mayacamas Range, just 89 meters from the nearest road and essentially roadside accessible. The spring provides water 61.7 degrees warmer than the ambient temperature of 58 degrees.
The spring sits in dense coniferous and hardwood forest characteristic of the inner northern California Coast Ranges. The relatively high elevation and abundant precipitation (34.4 inches annually) create a lush, green landscape distinct from lower-elevation springs. The water emerges in a forested setting where scattered trees shade the pools.
History of Sulphur Creek
The spring reflects geothermal activity in the Mayacamas Range, a north-south trending mountain range created by strike-slip faulting and crustal deformation. The range's elevated geothermal gradient results from heat flow associated with ongoing tectonism in the California Coast Ranges.
Roadside accessibility makes this spring immediately approachable with minimal walking. The forested setting and high precipitation create a cooler, wetter environment than most California springs—winter snow can occasionally block access though melts quickly. Warm Springs Recreation Area lies 20.8 kilometers south as a day-use facility.
Is Sulphur Creek worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Sulphur Creek offers an accessible hot spring experience — great for a day trip.
Annual Precip: 34.4 in
Annual Snow: 2.0 in
December
Air 45°F · Water 120°F · +75° contrast
January
Air 46°F · Water 120°F · +74° contrast
February
Air 47°F · Water 120°F · +73° contrast
December offers 29°F more contrast than July
Overview
Warm Springs Recreation Area is a day-use park located at Lake Sonoma, which is just a 45 minute drive north of Santa Rosa and a 2 hour trip from San Francisco. There is no overnight camping available at this facility
World famous vineyards and a land rich in history surround the lake, where visitors enjoy boating, fishing and exploring the area's extensive trail network.Recreation
The Woodland Ridge Nature Trail begins at the park and winds up the ridge, rewarding hikers with great...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Warm Springs Rec Area
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
USGS Quad: (THE GEYSERS 7.5) · PP 492: 73.0 · Circ 790: 48.0 · NOAA: 22.0 · AMS Map: SANTA ROSA
What is the water temperature at Sulphur Creek?
Sulphur Creek has a water temperature of 120°F (49°C). This is considered a hot spring, well above body temperature.
Where is Sulphur Creek located?
Sulphur Creek is located in Lake County, California at 2,039 feet elevation, near Cobb. Coordinates: 38.7880°N, 122.7770°W.
How do I get to Sulphur Creek?
Sulphur Creek has Roadside road access (295 ft from the road).
Can I camp near Sulphur Creek?
Yes, Warm Springs Rec Area is located nearby (12.9 miles away).
Is it safe to soak at Sulphur Creek?
At 120°F, Sulphur Creek is hot enough to require caution. Enter slowly, limit soaking sessions to 15–20 minutes, and stay hydrated. Access may be on private land or unconfirmed — verify current conditions before visiting. Always tell someone your plans before visiting remote hot springs.
Is Sulphur Creek crowded?
Sulphur Creek is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Sulphur Creek?
Essentials for Sulphur Creek: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.