Mono Basin Warm Springs
Mono Basin Warm Springs flows at 88°F along the eastern shore of ancient Mono Lake at 6,434 feet elevation, creating a 39-degree temperature differential above the 48.7°F alpine climate. This geothermal feature sits in one of California's most remote and geologically distinctive regions, where alkaline lake waters meet mineral-rich thermal springs.
The spring emerges along Mono Lake's eastern shore in high desert scrubland dominated by sagebrush and scattered conifers adapted to extreme aridity and seasonal temperature swings. The short 150-foot walk from East Shore Road leads to warm mineral water meeting the remarkable saline and alkaline waters of Mono Lake—the contrast between fresh thermal discharge and the lake's chemical composition creates a unique ecological gradient.
Access is straightforward from East Shore Road—the spring lies just 150 feet away on an easy walk. Winter snows (54 inches annually) may block access November through March; visit April through October for reliable access. The high desert setting offers unique combinations of thermal soaking, alkaline lake exploration, and dramatic geology. Bring sun protection and expect windy conditions typical of the eastern Sierra high country.
Mono Basin sits within the Long Valley caldera region, one of California's most active geothermal areas. The spring's presence reflects deep circulation through hot subsurface rocks; Mono Lake itself is fed by numerous thermal and mineral springs. The alkaline lake represents an evaporative basin created when Pleistocene megafaunas roamed California; thermal springs here are relicts of that ancient geothermal system.
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Rustic campsites with fire rings in Jeffrey Pine Forest. There is no trash service please pack out your trash.
Mono Basin Warm Springs sits at 6,434 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 26% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Mono Basin Warm Springs is road-accessible, so you can bring more gear.
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