Boyes Hot Springs is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, United States. The population was 6,665 people at the 2000 census. Resorts in Boyes Hot Springs, El Verano, Fetters Hot Springs, and Agua Caliente were popular health retreats for tourists from San Francisco and points beyond until the middle of the 20th century because of the geothermic hot springs that still well up from deep within the earth. Today the Sonoma Mission Inn in Boyes Hot Springs remains as a main destination resort, and the surrounding valley's wineries, historic sites, and natural beauty are popular tourist attractions.