Mercey Hot Springs Resort
By the HotSpringsFind editorial team · How we compile records · Reviewed September 2026
Mercey Hot Springs Resort is a resort hot spring listed near Firebaugh, California. Reported soak temperature: 104°F. See the visit fact sheet.
Current status
Remote, quiet-philosophy resort on Little Panoche Rd west of I-5; day use is $50/person for up to 5 hours between noon and 5pm BY RESERVATION ONLY (call 209-826-3388); outdoor therapeutic tubs run 102-106F plus an 85-90F swimming pool; overnight cabins, Airstreams and RV/tent sites get extended access.
Checked September 2026 · verified on the operator’s site · 6 sources ↓
Before you go
- Status: Reservation or permission required — confirm via Mercey Hot Springs — Day Rates page ($50 day-use, 12-5pm, reservation required).
- Cost: Reported $50 — confirm current rates before visiting.
- Getting there: Developed resort — confirm operating hours and any reservation requirement.
- Water: Reported soak temperature 104°F — always test the water before entering.
- Rules: Reported clothing-optional; pets reported not allowed — confirm current rules.
- Conditions: check weather, fire closures, and land-manager alerts the week you go — mountain access changes seasonally.
- Reservations/permits: No permits — reservation by phone (209) 826-3388; office hours 9am-8pm (holiday hours 9am-4pm).
- Booking: Reservation required.
- Best time to go: Weekdays — deliberately low-key venue; even weekends rarely feel crowded given remote location and reservation caps.
- Clothing reality: Official: clothing-optional ONLY in the private indoor bathhouse rooms and the cabin-area therapeutic hot tubs; guests must cover up walking to/from those areas, so suits are the rule at the main pool and public outdoor tubs. Customary: mixed — nudity normal in designated areas, suits elsewhere. Legal: private property, venue-designated areas.
- Kids: Allowed.
- Cell service: spotty — download maps and tell someone your plan.
- Accessibility: Rustic rural property with uneven ground; office can advise — no formal accessibility info published.
- Day-use is BY RESERVATION ONLY — call 9am-8pm; walk-ins not guaranteed
- Day-use guests must leave by 5pm sharp
- Day pass $50/person + fees, max 5 consecutive hours (12-5pm); children under 2 free, full rate after 2nd birthday
- All visitors must register at office with a pass — no 'just watching' guests
- Strict quiet policy: pool/tub/bathhouse areas are whisper-only 'quiet areas'; quiet time 9pm-8am
- No glass, alcohol, food, or oils in pool/tub areas; no amplified music
- Non-smoking property — $200 fee charged for smoking/incense evidence
- Pet-free zone; service dogs only; no pets left in vehicles
- Remote — nearest services far away; fill up before the drive on Little Panoche Rd
- No generators for RVs; campfires only in colder seasons in designated pits
- Hazard: Remote location — long drive on rural roads, limited services
- Hazard: Very hot tubs up to 106F
- Hazard: Campfire restrictions seasonal
About this spring
Off-grid eco resort in the Little Panoche Valley ~13 mi west of I-5 — ~20 therapeutic soaking tubs at 102-106°F plus a geothermally heated swimming pool; cabins, RV sites and camping on springs shown to settler John Merci in 1848. Fee: Day use ~$50 noon-5pm by reservation. Remote; clothing-optional; day-use window 12-5pm by reservation.
Mercey sits in the remote Little Panoche Valley of northwest Fresno County, 13 miles west of I-5 on what was once a stagecoach road serving the New Idria quicksilver mines. Native peoples used the springs for generations before showing them to sheep rancher John N. Merci — who Americanized his name to Mercy — and during the Gold Rush the watering place was known as Aguaje Panochita, a station on La Vereda del Monte used by the Five Joaquins Gang driving captured horses south. San Francisco developer Frederick Bourn bought the property in 1912, built a hotel, annex and seven cabins, and coined the 'Mercey' spelling so he could trademark and bottle the water through Owl & Liggett pharmacies; the old bottling 'Springhouse' survives as the chapel-like registration office. The hotel burned in the mid-1930s and was replaced by the bathhouse.
The geothermal water emerges around 110-119°F, sodium-chloride rich at roughly 2,300 ppm total solids, and feeds about 20 soaking tubs and a swimming pool at this off-grid, solar-powered, clothing-optional eco resort.
Directions & trailhead access
62964 Little Panoche Rd — I-5 exit 379 then 13 mi west.
California geothermal context
California spans several geothermal provinces: the volcanic Cascades and Modoc Plateau in the northeast, Sierra Nevada granite seeps along the eastern front, Mojave and Colorado Desert springs in the south, and the famously mineral-rich Big Sur coast. Fire season (roughly June–November) closes access to many backcountry springs without warning — always check for current fire restrictions.
What a resort site means here
A resort spring is a commercial operation: developed pools or tubs with controlled temperatures, changing facilities, and usually day-use fees or lodging packages. Expect posted rules (swimsuits, quiet hours, age limits), staff on site, and in many cases required reservations — especially on weekends and holidays.
Best time to visit
Year-Round (Best: May – October)Pool temperatures and access can change with weather and season. Outdoor ambient temperatures fluctuate significantly across California. Late spring through autumn offers the most comfortable road access.
Fact sheet
| Reported soak temp | 104°F |
|---|---|
| Source temp (historical) | 104°F |
| Trail access | Recorded coordinates — access unverified |
| Access fee | Reported $50 — verify |
| Clothing policy | Reported clothing-optional |
| Pet policy | Reported no pets |
| Geothermal data reference | NOAA Thermal Springs List (1980 archive) |
| Check land status | Mercey Hot Springs — Day Rates page ($50 day-use, 12-5pm, reservation required) |
Mercey Hot Springs Resort FAQ
Is Mercey Hot Springs Resort open right now?
Remote, quiet-philosophy resort on Little Panoche Rd west of I-5; day use is $50/person for up to 5 hours between noon and 5pm BY RESERVATION ONLY (call 209-826-3388); outdoor therapeutic tubs run 102-106F plus an 85-90F swimming pool; overnight cabins, Airstreams and RV/tent sites get extended access. (Status verified on the operator’s site, last checked September 2026.)
Is Mercey Hot Springs Resort free?
Mercey Hot Springs Resort is listed with reported fees near Firebaugh. Fees are reported; confirm admission, parking and permit costs with the site manager.
What temperature is Mercey Hot Springs Resort?
Mercey Hot Springs Resort has a reported soak temperature of 104°F and a historical source temperature of 104°F in survey records. Historical data may not reflect current conditions — always test water before entering.
Is Mercey Hot Springs Resort clothing optional?
Mercey Hot Springs Resort is listed as traditionally clothing-optional in directory records. Confirm current rules before visiting, as policies change.
How do you access Mercey Hot Springs Resort?
Mercey Hot Springs Resort is a private venue with paid public admission. Confirm current hours, fees and booking requirements with the operator before visiting.
Overnight options and spring admission
Book rooms, cabins or soaking times directly with the operator.
Check overnight options with the operatorSources & references
- Mercey Hot Springs — Day Rates page ($50 day-use, 12-5pm, reservation required) — operator · 2026
- Mercey Hot Springs — Guidelines & Policies (clothing-optional areas, pet-free, quiet rules, visitor pass rule) — operator · 2026
- Mercey Hot Springs — Reservations/General Info (office hours) — operator · 2026
- hotsprings.co — Mercey Hot Springs guide (kids under 2 free, towel rental $2) — community · 2026
Additional references for this record; a source link does not guarantee current conditions.
Details above were verified against the named sources on their listed dates — conditions change, so recheck before traveling. · How we verify our data · Report a correction
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