# Little Antelope Flat Warm Spring, Idaho

Little Antelope Flat Warm Spring in Idaho. 93°F (34°C). Roadside. Custer County.

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

## Can you soak at Little Antelope Flat Warm Spring?

The water leaves the ground at 93°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 | 93°F (34°C) (USGS record; developed pools are often cooled) |
| pH | 7.4 (Slightly Alkaline) |
| Elevation | 5,640 ft |
| Access | Roadside, 91 ft from the nearest road |
| County | Custer County |
| Nearest town | Challis |
| Coordinates | 44.38200, -114.08800 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |
| Nearest campground | Herd Lake Campground, 20.4 mi |

## About Little Antelope Flat Warm Spring

Little Antelope Flat Warm Spring is a roadside thermal point in Custer County, eleven miles from Challis. Soaking warm water, low nineties, that tested close to neutral in 1984. Owner and access status are blank. It has a USGS site number, a temperature, one old chemistry sample, and not much else on record.

Ninety feet or so separates the spring from the road. We cannot tell you which road. Elevation is fifty-six hundred feet. Snow is moderate, five feet or so a year, in a dry climate. Herd Lake Campground, twenty miles off, is the closest campground our data has. Nobody has entered a land unit for it.

By our numbers midwinter is driest. Roadside access means no walk. Check for posting, because access has never been recorded here. The 1984 sample is the most recent information we have, and the temperature came from that same visit, so treat both as dated.

## Water chemistry

Lab sample from 1984-03-08 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 7.4 |
| Calcium | 68 mg/L |
| Magnesium | 28 mg/L |
| Sodium | 39 mg/L |
| Sulfate | 130 mg/L |
| Chloride | 11 mg/L |

## Nearby

- Nearest city page: [Hot springs near Challis](https://www.soakingsprings.com/hot-springs/near/idaho/challis), 37 mi away
- State page: [Hot springs in Idaho](https://www.soakingsprings.com/hot-springs/idaho)
- [Beardsley Hot Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/beardsley-hot-springs): 109°F source, pH 7.0, Roadside, near Challis, Custer County, developed pools, pools 96–105°F, mid-march-nov
- [Sullivan Hot Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/sullivan-hot-springs): 106°F source, pH 6.9, TDS 684 mg/L, Roadside, near Challis, Custer County
- [Cronks Canyon Hot Spring, ID](https://www.soakingsprings.com/hot-springs/idaho/cronks-canyon-hot-spring): 115°F source, pH 7.9, Short Walk, near Challis, Custer County, primitive pools
- [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
- [Shower Bath Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/shower-bath-springs): 122°F source, pH 9.3, Hike, near Challis, Custer County, primitive pools, free, jul-oct
- [Robinson Bar Hot Springs, ID](https://www.soakingsprings.com/hot-springs/idaho/robinson-bar-hot-springs): 131°F source, pH 9.4, TDS 294 mg/L, Roadside, near Challis, Custer County

## Questions

**What is the water temperature at Little Antelope Flat Warm Spring?**
Little Antelope Flat Warm Spring has a water temperature of 93°F (34°C). This is a warm thermal spring.

**Where is Little Antelope Flat Warm Spring located?**
Little Antelope Flat Warm Spring is located in Custer County, Idaho at 5,640 feet elevation, near Challis. Coordinates: 44.3820°N, 114.0880°W.

**How do I get to Little Antelope Flat Warm Spring?**
Little Antelope Flat Warm Spring has Roadside road access (91 ft from the road).

**Can I camp near Little Antelope Flat Warm Spring?**
Yes, Herd Lake Campground is located nearby (20.4 miles away).

**What minerals are in the water at Little Antelope Flat Warm Spring?**
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 7.4 (slightly alkaline).

## Sources

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