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Mercey Hot Springs flows at a scalding 119°F, among California's hottest springs, located in the remote Little Panoche Valley west of Fresno. Once developed as a resort, this thermal feature sits in one of the state's least-populated regions, nearly 60 miles from the nearest city and accessible via unmarked backcountry roads.
The spring emerges at 1,212 feet elevation in rolling, semi-arid grassland dotted with oak and scattered shrubs. The warm mineral water creates a small oasis in otherwise dry terrain; the setting is quietly beautiful rather than dramatic—open sky, sparse vegetation, and a sense of profound isolation characterize the landscape.
History of Mercey Hot Springs
Mercey (formerly spelled Mercy) represents a historical resort that drew visitors through the late 19th and early 20th centuries, though little remains of those improvements today. The 55.2-degree temperature differential above the 63.8°F ambient climate reflects deep circulation of groundwater through heated bedrock. The name likely derives from an early settler.
Access requires navigating unmarked roads through private and public lands; route-finding requires local knowledge or detailed maps. Spring through early summer offers best conditions; rough roads may be impassable during heavy rains. This is decidedly remote—bring water, fuel, and supplies. Check land access permissions before visiting; some surrounding lands have restricted public access.
Is Mercey Hot Springs worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Mercey Hot Springs offers an accessible hot spring experience — great for a day trip.
Annual Precip: 10.0 in
Annual Snow: 0.1 in
December
Air 49°F · Water 119°F · +70° contrast
January
Air 50°F · Water 119°F · +69° contrast
February
Air 51°F · Water 119°F · +68° contrast
December offers 31°F more contrast than August
Overview
Pinnacles Campground is located in the unique Pinnacles National Park, 32 miles south of Hollister, California.
The park encompasses 26,000 acres of spectacular rock formations and remnants of an extinct 23 million-year old volcano.
Hiking and rock climbing are very popular activities in Pinnacles, as is watching for the majestic California condor overhead. Pinnacles National Park is a nesting place for the endangered soaring bird, the largest in North America.Recreation
Pinnacles N...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Pinnacles Campground
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
0 miles from South Dos Palos, CA
USGS Quad: MERCEY HOT SPRINGS 7.5 · PP 492: 132.0 · NOAA: 3.0 · AMS Map: SANTA CRUZ
What is the water temperature at Mercey Hot Springs?
Mercey Hot Springs has a water temperature of 119°F (48°C). This is considered a hot spring, well above body temperature.
Where is Mercey Hot Springs located?
Mercey Hot Springs is located in Merced County, California at 1,212 feet elevation, near South Dos Palos. Coordinates: 36.7030°N, 120.8600°W.
How do I get to Mercey Hot Springs?
Mercey Hot Springs has Roadside road access (206 ft from the road).
Can I camp near Mercey Hot Springs?
Yes, Pinnacles Campground is located nearby (24.0 miles away).
Is it safe to soak at Mercey Hot Springs?
At 119°F, Mercey Hot Springs 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 Mercey Hot Springs crowded?
Mercey Hot Springs 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 Mercey Hot Springs?
Essentials for Mercey Hot Springs: 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.