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Every Hot Spring

Aetna Springs

Aetna Springs is a geothermal spring in California. Water at the source is recorded at 91°F (33°C).

91°F33°C recorded at the source
Warm: pleasant on a hot day, cool in winter.

Facts

Coordinates
38.6540, -122.4840 (Google Maps, OSM)
Source temperature
91°F (33°C)
Access
Unknown
Type
Unknown
Fee
Not recorded
Clothing optional
Not recorded
Nearest town
Not recorded
Data sources
NOAA NCEI. See sources

Map

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

Quick answers

How hot is Aetna Springs?
The hottest recorded reading at the source is 91°F (33°C). That is the outlet temperature, not a pool temperature; water cools as it flows away from the source.
Where is Aetna Springs?
Aetna Springs is in California, at coordinates 38.6540, -122.4840.
What other hot springs are near Aetna Springs?
The closest listed springs, in straight-line distance, are Calistoga Hot Springs, 7 mi; Calistoga Spa Hot Springs, 7 mi; and St Helena White Sulphur Spring, 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