Fairmont Sonoma Mission Inn & Spa
- Call for prices
- 1 hr 11 min from San Francisco
- Walk-in OK
A large resort at Boyes Hot Springs, just north of Sonoma, built over thermal mineral springs. The adults-only Fairmont Spa has five geothermal mineral pools and a Roman-style bathhouse, while the family Main Resort Pool is also filled with naturally heated geothermal water and open year-round. Day visitors can book treatments or a spa pass through ResortPass.
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✓ Verified November 2026
- Price
- Call for prices
- Nearest town
- Sonoma
- From San Francisco
- 1 hr 11 min
- Reservations
- Walk-in OK
Plan your visit
Hours & season
| Hours |
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|---|---|
| Season | Open year-round |
Tickets & booking
| Price |
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|---|---|
| Access | Day pass, walk-ins welcome |
| Booking |
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Rules
| Ages |
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On site
| Pools | 6 |
|---|---|
| Lodging | Yes |
Not stated by the venue: swimwear, dogs.
Water temperature
This venue doesn't publish pool temperatures.
Mineral profile
Total dissolved minerals
1,220 mg/L
Moderately mineralized · Sodium–chloride (salty, brine-like water)
- pH
- 8.3
- Temp at source
- 95°F
- Lithium
- 1.7 mg/L
- Fluoride
- 8.1 mg/L
- Boron
- 15.9 mg/L
- Iron
- 0.38 mg/L
Lab analysis of the source water at a USGS sampling site, sampled 2004–2007 by the USGS and partners (data). Pool water may be cooled, mixed or treated, and spring chemistry is generally stable over decades. We report measurements only; we don't make health claims.
The pools
| Pool | Temp |
|---|---|
| Main Resort PoolFamily-friendly; filled with naturally heated geothermal water, open year-round. | — |
| Fairmont Spa pools (5)Five geothermal mineral pools including a Jacuzzi; 18+. | — |
As published by the venue. Temperatures shift with the seasons and the weather.
Facilities
- Food on site: yes
- Drinks / bar: yes
- Massage: yes
| Good to know |
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What's here
- five geothermal mineral pools at Fairmont Spa
- Roman-style bathhouse and Bathing Ritual
- family-friendly geothermal Main Resort Pool
- 40,000 sq ft adults-only spa
- Santé restaurant
- Sonoma Golf Club
Getting there
- From San Francisco1 hr 11 min47 mi
- From Santa Rosa31 min19 mi
- From Santa Rosa (STS)42 min27 mi
Typical driving time without traffic or snow.
| Elevation | 129 ft |
|---|---|
| Road |
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| Parking |
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Things to do near Sonoma
Jack London State Historic Park
Jack London's ranch, ruins of Wolf House and hiking trails above Glen Ellen.
Sonoma State Historic Park
Mission San Francisco Solano and other historic sites around Sonoma Plaza.
Sugarloaf Ridge State Park
Trails, camping and an observatory in the Mayacamas Mountains near Kenwood.
Trailheads
- Marie Creek Trailhead14.2 mi
Straight-line distances. Campground and trailhead data © OpenStreetMap contributors.
Nearby springs
Morton's Warm Springs
A family-oriented summer swimming resort in the Valley of the Moon with two geothermal mineral pools and a toddler wading pool, all around 90-94°F. The grounds along Sonoma Creek have picnic lawns and BBQs, and the deep pool is reserved for adult swim each morning. It is closed for the off-season and reopens May 1, 2027.
Calistoga Spa Hot Springs
A downtown Calistoga resort built around four outdoor pools filled with geothermal mineral water from a well beneath the property, ranging from about 80 to 104°F. The covered, jetted octagonal Jet Pool is adults only. Pools are for room guests and people booking spa treatments, which include traditional volcanic ash mud baths.
Dr. Wilkinson's Backyard Resort & Mineral Springs
Calistoga's resort and spa running since 1952 on Lincoln Avenue, with three geothermal mineral pools, one indoor and two outdoor, set at about 85, 95 and 104°F. The 104°F Hot Spring is adults only. Day visitors can buy pool passes, daybeds and cabanas through ResortPass, and the spa still offers its original mud bath, The Works.
Morton's Warm Springs: 7 mi · Calistoga Spa Hot Springs: 19 mi · Dr. Wilkinson's Backyard Resort & Mineral Springs: 19 mi
Sources (5)
· checked November 2026
Prices, hours and rules are checked against the official site and land-agency pages. Spot something out of date? Let us know.