File:M 3811857 se 11 060 20220710.tif — public domain
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.
History of Mono Basin Warm Springs
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.
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.
Is Mono Basin Warm Springs worth visiting?
Best for
- Warm-water soaking
- Overnight camping trips
Mono Basin Warm Springs is well suited for warm-water soaking and overnight camping trips.
Annual Precip: 12.9 in
Annual Snow: 54.8 in
December
Air 29°F · Water 88°F · +59° contrast
January
Air 30°F · Water 88°F · +58° contrast
February
Air 30°F · Water 88°F · +58° contrast
December offers 43°F more contrast than July
Rustic campsites with fire rings in Jeffrey Pine Forest. There is no trash service please pack out your trash.
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Lower Virginia Creek Primitive Campground
Trash bag
Pack out what you pack in
55 miles from Mammoth Lakes, CA
USGS Quad: TRENCH CANYON 15 · PP 492: 121.0 · NOAA: 1.0 · AMS Map: WALKER LAKE
What is the water temperature at Mono Basin Warm Springs?
Mono Basin Warm Springs has a water temperature of 88°F (31°C). This is a warm thermal spring.
Where is Mono Basin Warm Springs located?
Mono Basin Warm Springs is located in Mono County, California at 6,434 feet elevation, near Mammoth Lakes. Coordinates: 38.0330°N, 118.9020°W.
How do I get to Mono Basin Warm Springs?
Mono Basin Warm Springs has Short Walk road access, with the nearest road being East Shore Road (491 ft from the road).
Is Mono Basin Warm Springs free to visit?
Mono Basin Warm Springs has Open access. It is managed by SDOL.
Can I camp near Mono Basin Warm Springs?
Yes, Lower Virginia Creek Primitive Campground is located nearby (17.8 miles away).
Is it safe to soak at Mono Basin Warm Springs?
Mono Basin Warm Springs is generally safe for soaking at its recorded temperature. Always tell someone your plans before visiting remote hot springs.
Is Mono Basin Warm Springs crowded?
Mono Basin Warm Springs sees varying levels of visitors depending on the season and day of the week.
What should I bring to Mono Basin Warm Springs?
Essentials for Mono Basin Warm Springs: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in.