Natural hot spring · Montana
Boulder Hot Springs
Jefferson County, Montana · 3 miles southeast of Boulder, MT
Last updated
- Type
- Natural Natural hot spring
- Water temperature
- 169°F (76°C) at the source
- Cost
- Not recorded
- Hours or season
- Not recorded
- Clothing
- Not recorded
- Nearest town
- Boulder, MT (3 mi / 5 km)
- Coordinates
- Pools or sources
- 1
- Scalding: recorded at 50°C or above. Water at this temperature causes burns in seconds.
About Boulder Hot Springs
Editor's note. Boulder Hot Springs is a historic hotel and bathhouse between Butte and Helena. It has indoor plunges and an outdoor pool, and it runs as a retreat with a quiet atmosphere.
Boulder Hot Springs is a natural hot spring in Jefferson County, Montana, about 3 miles southeast of Boulder, MT. The nearest large city is Butte, MT, roughly 25 miles away as the crow flies.
The temperature at the source has been recorded at 169°F (76°C). That puts it in the "too hot to enter at the source" range. Water this hot can burn skin quickly. Soaking pools are usually cooled by mixing with creek or tap water. Never enter the source itself.
It is a natural spring with little or no development. Some natural springs have rock pools you can sit in, while others are too hot, too shallow or on land where soaking is not allowed.
Water temperature
Too hot to enter at the source. Water this hot can burn skin quickly. Soaking pools are usually cooled by mixing with creek or tap water. Never enter the source itself.
Readings come from the NOAA thermal springs list, and other public sources. Temperatures change with season, flow and pool design. See our soak temperature guide for safe soaking times.
Map and directions
Red marks Boulder Hot Springs. Other colored dots are nearby springs in this directory. Coordinates: 46.19800, -112.09400.
Getting there
- Nearest town: Boulder, MT. The spring is about 3 miles (5 km) southeast of town in a straight line.
- Nearest large city: Butte, MT, about 25 miles (40 km) in a straight line.
- Planning from a city? See hot springs near Bozeman, MT.
- Use the directions buttons above for a driving route. Final roads to many springs are unpaved, seasonal or closed in winter, so check road conditions before you go.
Weather forecast
Live forecast for this exact spot from the US National Weather Service.
Hot springs near Boulder Hot Springs
- Alhambra Hot Springs 138°F
- Pipestone Hot Springs 135°F
- Broadwater (helena) Hot Springs 151°F
- Renova Hotspring 122°F
- Warm Springs (state Hospital) 172°F
- Gregson Hot Springs 158°F
Before you go
- Check the operator, land manager or park website for current hours, fees and closures. Details in any directory can go out of date.
- Pack out everything you bring, including food scraps. Do not use soap in natural pools.
- Keep your head above water. Warm fresh water can carry Naegleria fowleri, a rare but deadly amoeba that enters through the nose.
- Drink water, limit soaks to 10 to 20 minutes at a time in very hot water, and skip alcohol.
- Read our hot spring etiquette guide and safety guide.
Frequently asked questions
How hot is Boulder Hot Springs?
The temperature at the source has been recorded at 169°F (76°C), which is too hot to enter at the source. Water this hot can burn skin quickly. Soaking pools are usually cooled by mixing with creek or tap water. Never enter the source itself.
Where is Boulder Hot Springs?
Boulder Hot Springs is in Jefferson County, Montana, about 3 miles southeast of Boulder, MT. The GPS coordinates are 46.1980, -112.0940.
Can you soak at Boulder Hot Springs?
The source is too hot to enter safely. Natural springs vary. Some have pools built by visitors, others are too hot or shallow, and some are on private land or in areas where bathing is banned. Check local rules and test the water before you get in.
What hot springs are near Boulder Hot Springs?
The closest listed spring is Alhambra Hot Springs, about 18 miles north. Pipestone Hot Springs is about 22 miles away.
What should I bring to a hot spring?
Water to drink, a towel, sandals with grip, a bag to pack out trash, and warm layers for after your soak. At primitive springs bring a headlamp and tell someone where you are going.
Sources and corrections
This listing combines the NOAA NCEI Thermal Springs List. Data last refreshed August 2026. Source 1
Visited recently? Send a correction, such as a temperature reading, fee, closure or photo. If you look after this spring and want it removed, see removal requests.