Dr. Wilkinson's Backyard Resort and Mineral Springs has been a cornerstone of Calistoga wellness since 1952, offering world-renowned mud bath experiences and comprehensive spa treatments in the heart of Napa Valley. The signature volcanic ash mud baths, combining natural volcanic ash, Canadian peat, and Calistoga hot spring water, are complemented by eight private mineral baths, three geothermal mineral pools fed by the resort's own underground well, a geo-steam room, and outdoor treatment rooms in a reimagined spa garden. The treatment menu spans Swedish, deep tissue, and hot stone massages, rejuvenating body treatments, falling water therapies, and integrative wellness offerings such as acupuncture, reiki, cryotherapy, and aromatherapy. The signature package known as the Works guides guests through a complete restorative sequence. A member of Design Hotels, the resort blends historic Calistoga character with a thoughtfully updated wellness philosophy.