Natural hot spring · Idaho
Keithly Warm Spring
Washington County, Idaho · 21 miles northeast of Weiser, ID
Last updated
- Type
- Natural Natural hot spring
- Water temperature
- 86°F (30°C) at the source
- Cost
- Not recorded
- Hours or season
- Not recorded
- Clothing
- Not recorded
- Nearest town
- Weiser, ID (21 mi / 33 km)
- Coordinates
- Pools or sources
- 1
- Historical record only: this spring has not been confirmed on the ground since 1981 and may be on private land.
About Keithly Warm Spring
Keithly Warm Spring is a natural hot spring in Washington County, Idaho, about 21 miles northeast of Weiser, ID. The nearest large city is Caldwell, ID, roughly 58 miles away as the crow flies.
The temperature at the source has been recorded at 86°F (30°C). That puts it in the "warm" range. Comfortable for long soaks, like a warm bath that has cooled a little.
It is a natural spring with little or no development. Some natural springs have rock pools you can sit in, while others are too hot, too shallow or on land where soaking is not allowed.
This spring comes from the US federal Thermal Springs List compiled in 1981. Nobody has confirmed it on the ground for this directory since, so treat the details as historical. Many springs on that list sit on private ranch land, so never visit without permission.
Water temperature
Warm. Comfortable for long soaks, like a warm bath that has cooled a little.
Readings come from the NOAA thermal springs list, and other public sources. Temperatures change with season, flow and pool design. See our soak temperature guide for safe soaking times.
Map and directions
Red marks Keithly Warm Spring. Other colored dots are nearby springs in this directory. Coordinates: 44.49500, -116.73200.
Getting there
- Nearest town: Weiser, ID. The spring is about 21 miles (33 km) northeast of town in a straight line.
- Nearest large city: Caldwell, ID, about 58 miles (93 km) in a straight line.
- Use the directions buttons above for a driving route. Final roads to many springs are unpaved, seasonal or closed in winter, so check road conditions before you go.
Weather forecast
Live forecast for this exact spot from the US National Weather Service.
Hot springs near Keithly Warm Spring
- Fairchild Hot Spring 126°F
- Crane Creek Hot Springs 198°F
- White Licks Hot Spring 140°F
- Starkey Hot Springs 131°F
- Belvidere Hot Spring 111°F
- Cabarton Hot Spring 160°F
Before you go
- Check the operator, land manager or park website for current hours, fees and closures. Details in any directory can go out of date.
- Pack out everything you bring, including food scraps. Do not use soap in natural pools.
- Keep your head above water. Warm fresh water can carry Naegleria fowleri, a rare but deadly amoeba that enters through the nose.
- Drink water, limit soaks to 10 to 20 minutes at a time in very hot water, and skip alcohol.
- Read our hot spring etiquette guide and safety guide.
Frequently asked questions
How hot is Keithly Warm Spring?
The temperature at the source has been recorded at 86°F (30°C), which is warm. Comfortable for long soaks, like a warm bath that has cooled a little.
Where is Keithly Warm Spring?
Keithly Warm Spring is in Washington County, Idaho, about 21 miles northeast of Weiser, ID. The GPS coordinates are 44.4950, -116.7320.
Can you soak at Keithly Warm Spring?
Natural springs vary. Some have pools built by visitors, others are too hot or shallow, and some are on private land or in areas where bathing is banned. Check local rules and test the water before you get in.
What hot springs are near Keithly Warm Spring?
The closest listed spring is Fairchild Hot Spring, about 2.7 miles northwest. Crane Creek Hot Springs is about 13 miles away.
What should I bring to a hot spring?
Water to drink, a towel, sandals with grip, a bag to pack out trash, and warm layers for after your soak. At primitive springs bring a headlamp and tell someone where you are going.
Sources and corrections
This listing combines the NOAA NCEI Thermal Springs List. Data last refreshed August 2026. Source 1
Visited recently? Send a correction, such as a temperature reading, fee, closure or photo. If you look after this spring and want it removed, see removal requests.