# Pierson Hot Springs, Idaho

Pierson Hot Springs in Idaho. 109°F (43°C). Roadside. Blaine County.

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

## Can you soak at Pierson Hot Springs?

The water leaves the ground at 109°F, a comfortable soaking temperature. You can drive right up to it. We haven't confirmed whether it has a pool or charges a fee.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 109°F (43°C) (USGS record; developed pools are often cooled) |
| pH | 9.3 (Alkaline) |
| Elevation | 6,900 ft |
| Access | Roadside, 252 ft from the nearest road (Valley Road) |
| County | Blaine County |
| Nearest town | Ketchum |
| Coordinates | 43.99000, -114.80000 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |
| Nearest campground | ALTURAS LAKE PICNIC AREA (ID), 5.1 mi |

## About Pierson Hot Springs

Thirty miles from Ketchum in Blaine County, Pierson Hot Springs sits right off Valley Road, close enough to count as roadside. The temperature is right at the top of comfortable soaking, a touch under hot. No owner or access entry exists for it in the record. Alturas Lake Picnic Area is about five miles away.

High. Close to seven thousand feet, where the year runs cold on average and winters bring thirteen feet of snow. That snow is the main fact about getting here. The spring is right beside Valley Road, so once you can drive the road you can reach the water. The land manager is not on file.

The record points to winter, and the water would suit that, but the snowpack means you need to know Valley Road is open. Alturas Lake Picnic Area is the closest camping on record. There is no fee information. The chemistry comes from a 1979 sample. Check land ownership and access before you go. Neither is recorded.

## Water chemistry

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

| Measure | Value |
|---|---|
| pH | 9.3 |
| Calcium | 2.6 mg/L |
| Magnesium | 0.1 mg/L |
| Sodium | 51 mg/L |
| Sulfate | 32 mg/L |
| Chloride | 3.9 mg/L |

## Nearby

- Nearest city page: [Hot springs near Challis](https://www.soakingsprings.com/hot-springs/near/idaho/challis), 19 mi away
- State page: [Hot springs in Idaho](https://www.soakingsprings.com/hot-springs/idaho)
- [Rosalys Warm Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/rosalys-warm-spring): 106°F source, pH 9.4, Short Walk, near Sun Valley, Blaine County
- [Lower Bowery Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/lower-bowery-hot-spring): 129°F source, pH 8.5, Short Walk, near Sun Valley, Blaine County, primitive pools, may–dec
- [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
- [West Pass Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/west-pass-hot-spring): 124°F source, pH 8.5, Roadside, near Sun Valley, Blaine County
- [Russian John Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/russian-john-hot-spring): 100°F source, pH 9.2, Roadside, near Ketchum, Blaine County, primitive pools, pools 86–105°F, free, year-round
- [Leggit Creek Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/leggit-creek-hot-spring): Hot, pH 9.6, TDS 234 mg/L, Hike, near Fairfield, Camas County

## Questions

**What is the water temperature at Pierson Hot Springs?**
Pierson Hot Springs has a water temperature of 109°F (43°C). This is considered a hot spring, well above body temperature.

**Where is Pierson Hot Springs located?**
Pierson Hot Springs is located in Blaine County, Idaho at 6,900 feet elevation, near Ketchum. Coordinates: 43.9900°N, 114.8000°W.

**How do I get to Pierson Hot Springs?**
Pierson Hot Springs has Roadside road access, with the nearest road being Valley Road (252 ft from the road).

**Can I camp near Pierson Hot Springs?**
Yes, Alturas Lake Picnic Area (Id) is located nearby (5.1 miles away).

**What minerals are in the water at Pierson Hot Springs?**
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 9.3 (alkaline).

## Sources

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