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Every Hot Spring

Boulder Hot Springs

Boulder Hot Springs is a resort hot spring near Boulder in Montana. Water at the source is recorded at 169°F (76°C), hot enough to scald.

169°F76°C recorded at the source
Scalding at the source. Do not enter without a cooled, mixed pool.

Boulder Hot Springs Inn, Spa and Retreat Center is a historic hot springs inn on almost 300 acres in the Peace Valley south of Helena near Boulder, run as an alcohol, drug and smoke-free retreat.

Facts

Coordinates
46.1980, -112.0940 (Google Maps, OSM)
Source temperature
169°F (76°C)
Access
Resort or commercial
Type
Resort
Fee
Not recorded
Clothing optional
Not recorded
Nearest town
Boulder
State
Montana
Data sources
NOAA NCEI, Wikipedia, Official sources (linked below). See sources

Map

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

Quick answers

Can you soak at Boulder Hot Springs?
Boulder Hot Springs is a resort or commercial operation, so soaking is on the operator’s terms. Check the operator’s website for hours, prices and reservations.
How hot is Boulder Hot Springs?
The hottest recorded reading at the source is 169°F (76°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 Boulder Hot Springs?
Boulder Hot Springs is near Boulder in Montana, at coordinates 46.1980, -112.0940.
What other hot springs are near Boulder Hot Springs?
The closest listed springs, in straight-line distance, are Alhambra Hot Springs, 18 mi; Hot Springs (Jefferson County), 22 mi; and Pipestone Hot Springs, 22 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.

Checked against

  1. Operator website (boulderhotsprings.com)

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