HillTop Hot Springs is located in Mammoth Lakes, Mono County, California, at the foot of the Sierra Nevada. The thermal water, pH 7.3, feeds indoor and outdoor baths, with a sauna and massage also available.
Insider tip — HillTop Hot Springs is a free natural thermal spring near Mammoth Lakes, in the Long Valley Caldera (Mono County, CA). The site is reached by a short hike and offers panoramic views of the Sierra Nevada. Mammoth Lakes is an active volcanic area with dozens of hot springs scattered through the valley.