File:M 3812211 ne 10 060 20220524.tif — public domain
Spiers Springs flows at 79°F in the forested hills of Lake County near Cobb, situated in the geothermally active wine country thermal belt north of San Francisco.
The spring emerges at 1,419 feet elevation in the Mayacamas Mountains, positioned just 62 feet from Big Canyon Road for easy access. The surrounding landscape features oak woodlands and coniferous forests with 26.8 inches of annual precipitation, creating green rolling terrain in one of California's premier wine-growing regions.
History of Spiers Springs
This spring lies within the geothermal belt extending from The Geysers southward through the North Coast Ranges, an area of significant volcanic and tectonic activity that produces numerous hot springs. The region's thermal characteristics have long made it distinctive in California's landscape.
The roadside location near Big Canyon Road makes this spring one of Lake County's most accessible thermal features. The proximity to wine country, Lake Sonoma recreational areas, and the Warm Springs Recreation Area makes this a convenient addition to a regional visit. Access is straightforward year-round.
Is Spiers Springs worth visiting?
Best for
- Easy day trips
- Overnight camping trips
Spiers Springs is well suited for easy day trips and overnight camping trips.
Annual Precip: 26.8 in
Annual Snow: 1.4 in
December
Air 47°F · Water 79°F · +32° contrast
January
Air 48°F · Water 79°F · +31° contrast
February
Air 49°F · Water 79°F · +30° contrast
December offers 31°F more contrast than July
Overview
Warm Springs Recreation Area is a day-use park located at Lake Sonoma, which is just a 45 minute drive north of Santa Rosa and a 2 hour trip from San Francisco. There is no overnight camping available at this facility
World famous vineyards and a land rich in history surround the lake, where visitors enjoy boating, fishing and exploring the area's extensive trail network.Recreation
The Woodland Ridge Nature Trail begins at the park and winds up the ridge, rewarding hikers with great...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Warm Springs Rec Area
Trash bag
Pack out what you pack in
USGS Quad: (WHISPERING PINES 7.5) · PP 492: 61.0 · Circ 790: 47.0 · NOAA: 18.0 · AMS Map: SANTA ROSA
What is the water temperature at Spiers Springs?
Spiers Springs has a water temperature of 79°F (26°C). This is a warm thermal spring.
Where is Spiers Springs located?
Spiers Springs is located in Lake County, California at 1,419 feet elevation, near Cobb. Coordinates: 38.8380°N, 122.6530°W.
How do I get to Spiers Springs?
Spiers Springs has Roadside road access, with the nearest road being Big Canyon Road (204 ft from the road).
Can I camp near Spiers Springs?
Yes, Warm Springs Rec Area is located nearby (20.4 miles away).
Is it safe to soak at Spiers Springs?
Spiers Springs is generally safe for soaking at its recorded temperature. Access may be on private land or unconfirmed — verify current conditions before visiting. Always tell someone your plans before visiting remote hot springs.
Is Spiers Springs crowded?
Spiers Springs is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Spiers Springs?
Essentials for Spiers Springs: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in.