California has 64 hot springs, including 16 free primitive soaks and 48 paid resorts, the widest range of soaking styles in the country, spanning Sierra backcountry pools, high-desert wild soaks, coastal cliffside tubs, and Napa/Calistoga wine-country spas. California is the only state where in a single day you can drive from a clothing-optional cliffside soak on the Pacific to a champagne-service resort in wine country to a Sierra Nevada wilderness pool. Springs cluster in five regions: the Eastern Sierra (Travertine, Wild Willy's, Hilltop, Buckeye), the Big Sur/Central Coast (Sykes, Esalen), Northern California (Harbin, Wilbur, Orr), the Mojave (Deep Creek, Saline Valley), and Calistoga wine country (Indian Springs, Dr. Wilkinson's). Flagship sites include Travertine Hot Springs, Esalen, Harbin, and Deep Creek. California's thermal activity is fed by the San Andreas fault system, the Long Valley Caldera, and geothermal areas near the Salton Trough. Surface temperatures range 90-180°F. Land ownership is mixed: BLM (Eastern Sierra), National Forest (Sequoia, Inyo), state parks, and private resorts. Access ranges from drive-up to multi-day backpack (Sykes is a 10-mile hike each way). Best season varies by region while Sierra sites are snowed in until June. Gateway airports are LAX, SFO, Reno, and Fresno. Clothing-optional is common at wild sites and specific resorts (Esalen, Harbin, Deep Creek). Reviewed and updated August 2026. Start with the map to filter by region and access type.
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