Apex Warm Spring

Beaverhead County, Montana · Near Dillon
45.4200°N, 112.6920°W · 5,255 ft
77°F 31°F air · Good soaking weather 5,255 ft Short Walk Camping nearby (7.9 mi)
Aerial view of the ground around Apex Warm Spring LiDAR bare-earth view of the same ground around Apex Warm Spring
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

A warm spring outside Dillon in Beaverhead County, roughly fourteen miles from town. Apex Warm Spring earns the word warm and nothing more; the water is tepid, bath-cool, and no one would mistake it for a hot soak. No one has logged a landowner or said whether visitors may come, so the record is thin. No photo exists for it yet.

Location

School House Road runs within a couple hundred yards, and the last stretch is a short walk. The spring sits at valley elevation, well below the high country, in a dry corner of the state that sees moderate snow most winters.

The three winter months get the nod as the better season. Snow here is modest compared with the mountains, so that window is plausible. Birch Creek Cabin, about eight miles off, is the only camp the record turns up. There is no water chemistry on file and no confirmed access, so assume private ground and ask locally before walking in.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Apex Warm Spring.

Setting
Hillside
The spring sits on a steep slope that climbs to the south.
Highest ground nearby
329 ft above the spring
Within a quarter mile, to the south
Cross-section through the spring

A slice through the ground from south to north, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
99 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 45% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
19°
Jan
21°
Feb
31°
Mar
39°
Apr
49°
May
59°
Jun
69°
Jul
68°
Aug
57°
Sep
42°
Oct
29°
Nov
17°
Dec
Annual Precip: 16.4 in Annual Snow: 51.1 in
Best Time to Visit
December Air 17°F · Water 77°F · +60° contrast
January Air 19°F · Water 77°F · +58° contrast
February Air 21°F · Water 77°F · +57° contrast
December offers 52°F more contrast than July
Current Conditions
31°F
S 7.2 mph 87% Good soaking weather
Today 69° Low 36° Sunny
Spring is +8° warmer
Wednesday 69° Low 41° Sunny 4% precip
Spring is +8° warmer
Thursday 72° Low 44° Mostly Sunny then Chance Showers And Thunderstorms 52% precip
Spring is +5° warmer
Friday 66° Low 40° Chance Rain Showers 54% precip
Spring is +11° warmer
Saturday 69° Low 41° Mostly Sunny then Slight Chance Light Rain 15% precip
Spring is +8° warmer
Nearby Camping
Nearby Camping
Birch Creek Cabin 7.9 mi away

Overview Birch Creek Cabin is a historic log cabin with electricity. It provides access to a variety of hiking, ohv, and for cross-country skiing and snowshoe trails (depending on the season). A vaulted toilet lies 100' west of the cabin. Guests can typically access the cabin by vehicle, depending on conditions. The roads leading to the cabin are gravel - but suitable for passenger cars (depending on the season and snow levels). The final quarter-mile may be covered with impassible snow d...

Reservable Yes
Reserve on Recreation.gov →
Temperature
77°F
Warm Hot Boiling
Water Temp 77°F (25°C)
Avg Air Temp 42°F
Above Ambient +35°F
Mild soaking conditions September
Access
Road Access Short Walk
Nearest Road School House Road
Distance to Road 0.2 mi
Frequently Asked Questions
What is the water temperature at Apex Warm Spring?
Apex Warm Spring has a water temperature of 77°F (25°C). This is a warm thermal spring.
Where is Apex Warm Spring located?
Apex Warm Spring is located in Beaverhead County, Montana at 5,255 feet elevation, near Dillon. Coordinates: 45.4200°N, 112.6920°W.
How do I get to Apex Warm Spring?
Apex Warm Spring has Short Walk road access, with the nearest road being School House Road (0.2 mi from the road).
Can I camp near Apex Warm Spring?
Yes, Birch Creek Cabin is located nearby (7.9 miles away).