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Every Hot Spring

Potosi Hot Springs

Potosi Hot Springs is a geothermal spring in Madison County, Montana. Water at the source is recorded at 122°F (50°C), hot enough to scald.

122°F50°C recorded at the source
Scalding at the source. Do not enter without a cooled, mixed pool.

Facts

Coordinates
45.5897, -111.8997 (Google Maps, OSM)
Source temperature
122°F (50°C)
Access
Unknown
Type
Unknown
Fee
Not recorded
Clothing optional
Not recorded
Nearest town
Not recorded
State
Montana
Data sources
NOAA NCEI, Wikipedia, Wikidata. See sources

Map

Larger marker is Potosi Hot Springs; smaller markers are other springs within 50 miles.

Quick answers

How hot is Potosi Hot Springs?
The hottest recorded reading at the source is 122°F (50°C). That is the outlet temperature, not a pool temperature; water cools as it flows away from the source. Water this hot can cause serious burns, so test any pool by hand first.
Where is Potosi Hot Springs?
Potosi Hot Springs is in Madison County, Montana, at coordinates 45.5897, -111.8997.
What other hot springs are near Potosi Hot Springs?
The closest listed springs, in straight-line distance, are Warm Springs (Madison County), under 1 mi; Bear Trap Hot Springs, 10 mi; and Norris Hot Springs, 11 mi.

Before you go

  • Temperatures are measured at the source and can be far hotter than any soaking pool. Test with a hand before stepping in.
  • Access, fees, and road conditions change. Verify with the land manager or owner; "public" here reflects survey records, not a current right of entry.
  • Water in natural springs is untreated. Keep your head above water and avoid soaking with open wounds. Some springs carry Naegleria fowleri risk.
  • Pack out everything, including soap residue. Many springs have been closed because of trash and overcrowding.

Sources

Dataset last rebuilt October 11, 2026. Not yet checked on site by a person. Access, fee, clothing and closure details appear only when a source below states them. How this data is built.

Merged from

  1. NOAA NCEI Thermal Springs List (archived 2025): survey location and source temperature, public domain
  2. Wikipedia: short description, CC BY-SA 4.0
  3. Wikidata: name, county and website, CC0