# Rosalys Warm Spring, Idaho

Rosalys Warm Spring in Idaho. 106°F (41°C). Short Walk. Blaine County.

- Page: https://www.soakingsprings.com/hot-springs/idaho/rosalys-warm-spring
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at Rosalys Warm Spring?

The water leaves the ground at 106°F, a comfortable soaking temperature. It's a short walk from the road. We haven't confirmed whether it has a pool or charges a fee.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 106°F (41°C) (USGS record; developed pools are often cooled) |
| pH | 9.4 (Alkaline) |
| Elevation | 6,560 ft |
| Access | Short Walk, 0.3 mi from the nearest road |
| County | Blaine County |
| Nearest town | Sun Valley |
| Coordinates | 44.10100, -114.86500 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |
| Nearest campground | OUTLET CAMPGROUND, 3.6 mi |

## About Rosalys Warm Spring

Rosalys Warm Spring is a Blaine County spring about thirty-nine miles from Sun Valley and a third of a mile from the nearest road. Despite the name, the water is above body heat, hot enough to feel like a bath. Land owner and access are not on record. Outlet Campground is a few miles away.

High, around sixty-five hundred feet, with heavy snow, thirteen and a half feet across an average winter. The walk from the car is short. The road itself has no name in the record. Nothing is listed for a land unit or a designation, and the record is quiet on what the ground looks like.

Winter months are the listed best, though with that snowpack you need the road open. Outlet Campground, a few miles away, is the camping on file. No fee entry. The chemistry is from 1979. Check who owns the land and if you are allowed on it. The record says nothing either way.

## Water chemistry

Lab sample from 1979-09-12 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 9.4 |
| Calcium | 2.7 mg/L |
| Sodium | 57 mg/L |
| Sulfate | 34 mg/L |
| Chloride | 6.5 mg/L |

## Nearby

- Nearest city page: [Hot springs near Challis](https://www.soakingsprings.com/hot-springs/near/idaho/challis), 12 mi away
- State page: [Hot springs in Idaho](https://www.soakingsprings.com/hot-springs/idaho)
- [Pierson Hot Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/pierson-hot-springs): 109°F source, pH 9.3, Roadside, near Ketchum, Blaine County
- [Stanley Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/stanley-hot-spring): 106°F source, pH 8.8, Roadside, near Challis, Custer County
- [Elkhorn Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/elkhorn-hot-spring): 136°F source, Roadside, near Challis, Custer County, primitive pools, free, year-round
- [Mormon Bend Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/mormon-bend-hot-spring): 100°F source, Short Walk, near Challis, Custer County, primitive pools, free, jul-oct
- [Basin Creek Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/basin-creek-hot-spring): 133°F source, pH 9.5, Roadside, near Challis, Custer County, primitive pools, jun–oct
- [Slate Creek Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/slate-creek-hot-spring): 122°F source, pH 8.8, TDS 352 mg/L, Short Walk, near Challis, Custer County, primitive pools, free, jul-oct best

## Questions

**What is the water temperature at Rosalys Warm Spring?**
Rosalys Warm Spring has a water temperature of 106°F (41°C). This is considered a hot spring, well above body temperature.

**Where is Rosalys Warm Spring located?**
Rosalys Warm Spring is located in Blaine County, Idaho at 6,560 feet elevation, near Sun Valley. Coordinates: 44.1010°N, 114.8650°W.

**How do I get to Rosalys Warm Spring?**
Rosalys Warm Spring has Short Walk road access (0.3 mi from the road).

**Can I camp near Rosalys Warm Spring?**
Yes, Outlet Campground is located nearby (3.6 miles away).

**What minerals are in the water at Rosalys Warm Spring?**
Water chemistry analysis shows the presence of pH, Calcium, Sodium, Sulfate, Chloride. The pH is 9.4 (alkaline).

## Sources

- USGS thermal springs records, Water Quality Portal lab analyses, OpenStreetMap, Wikipedia/Wikidata, NOAA climate normals