Aetna Springs
Aetna Springs flows at 91 degrees Fahrenheit near Angwin in Napa County, running 29.8 degrees above ambient at just 814 feet elevation in the low hills east of famous Napa Valley wine country.
The spring sits approximately 151 feet from Aetna Springs Road in rolling hills marked by oak and oak-grassland landscape. Generous precipitation of 23.5 inches annually plus minimal snowfall of 0.5 inches creates mild, moist winters and moderately warm summers. The setting reflects transition zone between Valley floor and higher ridges with views toward distant blue mountains.
Aetna Springs emerged historically as a resort destination drawing visitors from the San Francisco Bay Area and beyond, reflecting both the mineral-rich thermal waters and proximity to developing wine regions. The thermal feature reflects circulation in bedrock beneath the Napa Valley and surrounding hills where geothermal heat builds with depth.
Roadside access requires permission from private landowners. The spring sits very close to the road, making reconnaissance from a distance possible. Oak Shores Day Use Area on Lake Berryessa lies 24 kilometers away, offering boating, fishing, and water recreation facilities. Visit October through May for comfortable temperatures.
Is Aetna Springs worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
Overview Nestled between Blue Ridge and Cedar Roughs east of Napa Valley, Lake Berryessa provides ample public recreation opportunities. Popular activities on and around the large, yet uncrowded lake include fishing, boating, water skiing, wake boarding, jet skiing, sailing, swimming, kayaking, canoeing, wildlife viewing, hiking, biking and picnicking. The Dufer Point Visitor Center offers year-round interpretive events and exhibits highlighting natural and cultural resources. Lake Berrye...