Calistoga Spa Hot Springs, formerly known as Calistoga Hot Sulfur Springs, is a geothermal spring system and resort located in the upper Napa Valley town of Calistoga, California.

The indigenous Wappo civilization occupied the region for thousands of years and annually migrated to the upper valley to village near the exposed mineral pools found along the western ridge of the Mayacamas mountain range.

Geothermal forces and tectonic activity elevate the temperature of the mineral water to 180 degrees Fahrenheit at the source.

Through use and age the pool fell into decline and was closed in 1985.

In 1986 a new main spa building was constructed to replace the Roman along with a mud bath and mineral bath facility.