Boulder Hot Springs
- Location
- Boulder, Montana, United States
- Water type
- thermal
- Temperature
- 40 °C
- pH
- 6.6
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Boulder Hot Springs Hotel is a historic thermal resort listed on the National Register of Historic Places, located in the Jefferson River valley near Boulder, Montana, where oligomineral geothermal waters have attracted visitors since the 1860s gold rush era in the surrounding mountains. The ornate mission-revival hotel building, dating from 1881 and extensively renovated, houses indoor plunge pools fed by the natural hot springs alongside outdoor facilities, preserving the grandeur of Montana's Victorian-era thermal tourism. Today the property operates as a retreat center offering thermal bathing, quiet contemplation, and a rare window into the heritage of frontier-era American spa culture.