West Fork Swimming Hole

Gallatin County, Montana · Near West Yellowstone
44.7850°N, 111.6490°W · 6,617 ft
79°F 35°F air · Good soaking weather 6,617 ft Open Short Walk US Forest Service Camping nearby (4.0 mi)

The name West Fork Swimming Hole more or less admits what this is: warm water on Beaverhead National Forest land in Gallatin County, Montana, about 28 miles out of West Yellowstone. Access is open. Tepid water, well short of a hot soak. Chemistry and sample date are both blank, as is the fee.

Location
13 miles from Virginia City, MT

Under a mile from the road, which the record leaves unnamed. This is high country, carrying eight feet of snow per winter and a moderately wet year. Wade Lake campground is four miles away. Forest Service ground, designated national forest. No trail is named, and no land designation beyond that.

Open access. The calendar in the record favors winter, and at this elevation winter is deep. Wade Lake is the camping to use. Fee: none recorded. There is no dated sample behind the temperature, and no chemistry at all, so the figure is approximate. Plan for a walk of under a mile.

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 West Fork Swimming Hole.

Aerial view of the ground around West Fork Swimming Hole LiDAR bare-earth view of the same ground around West Fork Swimming Hole
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.

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

A slice through the ground from northwest to southeast, about 0.6 miles end to end.

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

Heat Below
146 milliwatts per square meter of heat flow

That's about twice the US average of 65. It's higher than at 92% 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
16°
Jan
19°
Feb
27°
Mar
33°
Apr
42°
May
54°
Jun
64°
Jul
62°
Aug
52°
Sep
37°
Oct
23°
Nov
14°
Dec
Annual Precip: 22.7 in Annual Snow: 95.5 in
Best Time to Visit
December Air 14°F · Water 79°F · +65° contrast
January Air 16°F · Water 79°F · +63° contrast
February Air 19°F · Water 79°F · +61° contrast
December offers 50°F more contrast than July
Current Conditions
35°F
S 18.0 mph 80% Good soaking weather
Today 64° Low 37° Sunny
Spring is +15° warmer
Wednesday 70° Low 43° Sunny 5% precip
Spring is +9° warmer
Thursday 67° Low 43° Showers And Thunderstorms 77% precip
Spring is +12° warmer
Friday 62° Low 38° Chance Rain Showers 52% precip
Spring is +17° warmer
Saturday 65° Low 38° Mostly Sunny then Slight Chance Light Rain 18% precip
Spring is +14° warmer
Where to Stay

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Nearby Camping
Wade Lake (Mt) 4.0 mi away

Overview Wade Lake Campground is located in southwestern Montana on the shore of it’s scenic namesake lake. It is approximately 43 miles south of Ennis and 35 miles west of Yellowstone National Park. The 25 site campground, including two group sites, is situated in a dense Douglas Fir forest on the hillside above the lake. Each site is equipped with a picnic table and fire ring. Vault toilets and drinking water taps are provided in each of the two camping loops. The campground is situated on...

Reservable Yes
Reserve on Recreation.gov →
Mile-High Advisory 6,617 ft

West Fork Swimming Hole sits at 6,617 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 26% stronger than at sea level, so bring sunscreen and drink more water than you normally would.

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Temperature
79°F
Warm Hot Boiling
Water Temp 79°F (26°C)
Avg Air Temp 37°F
Above Ambient +42°F
Mild soaking conditions September
Access
Open
Road Access Short Walk
Distance to Road 0.9 mi
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Beaverhead National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at West Fork Swimming Hole?
West Fork Swimming Hole has a water temperature of 79°F (26°C). This is a warm thermal spring.
Where is West Fork Swimming Hole located?
West Fork Swimming Hole is located in Gallatin County, Montana at 6,617 feet elevation, near West Yellowstone. Coordinates: 44.7850°N, 111.6490°W.
How do I get to West Fork Swimming Hole?
West Fork Swimming Hole has Short Walk road access (0.9 mi from the road).
Is West Fork Swimming Hole free to visit?
West Fork Swimming Hole has Open access. It is managed by US Forest Service.
Can I camp near West Fork Swimming Hole?
Yes, Wade Lake (Mt) is located nearby (4.0 miles away).