Geothermal Mineral Springs at Sonoma Mission Inn & Spa

100 Boyes Blvd., Sonoma, CA, United States 95476
Tel +1(707)938-9000
Fax +1(707)938-4250
fsmi.reservations@fairmont.com

Geothermal Springs of Sonoma Mission Inn & Spa

Our spa pools and hot tub are open year-round for guests 18 years and older. Food and beverage pool service is offered seasonally in the warm weather months.

Main Pool Hours | 9am - 10pm daily

Spa Hours | 9am - 6pm daily

Resort Guests: $49 daily charge per person, Non-Resort Guests: $149 daily charge per person*

*This fee is waived for non-resort guests scheduling Spa services Monday – Thursday (excluding holidays; based on availability; blackout dates may apply) which must meet the minimum service value of $199. Advanced reservations are required. Weekend services (Friday – Sunday) hold a Spa access charge of $59 in addition to the service price; this will be added at check out.

Geothermal mineral springs-often called hot springs-are a fabulous wellness attribute of Sonoma County. The Geysers area in Northern Sonoma County represents part of the largest geothermal field in the world. Hot mineral springs, which exist around the world, are produced when geothermally-heated and mineralized groundwater emerges from the earth to form pools of water ranging from warmish to scalding.

The thermal waters of Boyes Hot Springs come in a luxurious setting at Fairmont Sonoma Mission Inn & Spa. Originally built in 1927 in the style of California's early missions, our property was renovated in the late 20th century. Shortly thereafter, a new thermal mineral water source was discovered more than 1,000 feet below the hotel.

The waters of Boyes Hot Springs can be enjoyed in the pools throughout the resort at the following temperature for your enjoyment.

Main pool - 85 degrees
Spa pool - 92 degrees
Watsu pool - 98 degrees

Written by Sonoma County Insider Suzie Rodriguez

"Most people enjoy springs that hit a sweet spot somewhere between warm and hot-the point at which water relaxes mind and body, soothes aching joints, and introduces a feeling of bliss."