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Hilltop Hot Spring produces 127°F water at 6,880 feet elevation in Mono County, just a short distance from Mammoth Lakes. Also known as Alkali Hot Springs, it runs 80°F above ambient temperature on the high desert edge, managed by the Bureau of Land Management.
The spring emerges from high desert terrain in a cool mountain environment where winter snow accumulates substantially. The thermal feature sits on public land administered by the BLM, with Benton Crossing Road just 16 meters away providing roadside access. The landscape transitions between exposed rock, sagebrush, and sparse alpine vegetation.
History of Hilltop Hot Spring
Hilltop Hot Spring draws its heat from deep crustal sources that power geothermal systems throughout the Eastern Sierra. Known locally as Alkali Hot Springs, the feature reflects the region's complex geothermal and hydrological history. Recent USGS analysis identified water chemistry with notable sodium and chloride content.
This roadside spring sits just 54 feet from the nearest road, offering direct access. Winter brings heavy snow around 72 inches annually, making seasonal access challenging. The alpine climate averages 47°F with modest precipitation. Nearby Crowley Lake Campground offers convenient overnight facilities 11 kilometers away.
Is Hilltop Hot Spring worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
- Mineral-rich therapeutic bathing
Hilltop Hot Spring offers an accessible hot spring experience — great for a day trip.
Annual Precip: 14.4 in
Annual Snow: 72.3 in
February
Air 29°F · Water 127°F · +98° contrast
December
Air 29°F · Water 127°F · +98° contrast
January
Air 30°F · Water 127°F · +97° contrast
February offers 39°F more contrast than July
Recent Temperature
134.8°F
(57.1°C)
Measured Jan 10, 1990
The water at Hilltop Hot Spring is neutral (pH 7.0) with 1260 mg/L total dissolved solids. It is notably rich in sodium (supports circulation and skin hydration), chloride (natural antiseptic with skin health benefits), and total dissolved solids (higher mineral concentration for therapeutic soaking).
pH influences mineral absorption through skin
Higher mineral concentration for therapeutic soaking
May support bone density and joint health
Known for muscle relaxation and stress relief
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
Iron-rich springs may support circulation
Overview
Crowley Lake Campground offers 47 RV/tent sites, maximum recommended RV length is 30 feet. All sites include a fire pit, picnic table and a lantern holder. No hook-up. Potable water is available. Dump station fee is $10.00, no passes accepted. Closest amenities are 2 miles south in Crowley, or 10 miles north in Mammoth Lakes.
Recreation
Popular activities include lake and stream fishing, boating, windsurfing, horseback riding, hiking, and wildlife viewing.
Facilities
Crowley Lake...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Crowley Lake Campground
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
30 miles from Mammoth Lakes, CA
USGS Quad: (MT. MORRISON 15) · Circ 790: 56.0 · NOAA: 7.0 · AMS Map: MARIPOSA
What is the water temperature at Hilltop Hot Spring?
Hilltop Hot Spring has a water temperature of 127°F (53°C). This is considered a hot spring, well above body temperature.
Where is Hilltop Hot Spring located?
Hilltop Hot Spring is located in Mono County, California at 6,880 feet elevation, near Mammoth Lakes. Coordinates: 37.6670°N, 118.7810°W.
How do I get to Hilltop Hot Spring?
Hilltop Hot Spring has Roadside road access, with the nearest road being Benton Crossing Road (55 ft from the road).
Is Hilltop Hot Spring free to visit?
Hilltop Hot Spring has Open access. It is managed by Bureau of Land Management.
Can I camp near Hilltop Hot Spring?
Yes, Crowley Lake Campground is located nearby (6.8 miles away).
What minerals are in the water at Hilltop Hot Spring?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 7.0 (neutral). Total dissolved solids measure 1,260 mg/L.
Is it safe to soak at Hilltop Hot Spring?
At 127°F, Hilltop Hot Spring is hot enough to require caution. Enter slowly, limit soaking sessions to 15–20 minutes, and stay hydrated. Always tell someone your plans before visiting remote hot springs.
Is Hilltop Hot Spring crowded?
Hilltop Hot Spring 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 Hilltop Hot Spring?
Essentials for Hilltop Hot Spring: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.