Hot Springs On Upper Sour Creek

Gallatin County, Wyoming · Near West Yellowstone
44.6810°N, 110.3260°W · 8,585 ft
194°F 26°F air · Good soaking weather 8,585 ft Open Backcountry National Park Service Camping nearby (14.7 mi)
Very Hot Source, Use Extreme Caution

At 194°F, the source water at Hot Springs On Upper Sour Creek is hot enough to cause burns. Some hot springs this hot have cooler side pools or downstream areas suitable for soaking. Always test the water temperature before entering.

Aerial view of the ground around Hot Springs On Upper Sour Creek LiDAR bare-earth view of the same ground around Hot Springs On Upper Sour Creek
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.

Up Sour Creek, in Yellowstone's Gallatin County backcountry, there are hot springs that run scalding, close to boiling. Nobody sits in this water. National Park Service land; the public can go in. About twenty miles off sits West Yellowstone, the town the record gives.

Location

Between the Grand Loop Road and these springs there are about six miles of backcountry. The elevation is high, nearly eighty-six hundred feet, cold enough that the annual average is thirty-two. Snow comes to roughly twelve feet, and rain on top of that is moderate. It is national park land with nothing built nearby on the record.

December through February are what the record calls best, which for a spot this far into the backcountry means winter travel and a check with the park on what is permitted. The only camping on record, Tower Fall Campground, is about fifteen miles out. Scalding water, so keep back from the source. Nothing on file about a fee.

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 Hot Springs On Upper Sour Creek.

Setting
Hillside
The spring sits on a steep slope that climbs to the north.
Highest ground nearby
210 ft above the spring
Within a quarter mile, to the north
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.

Seen From Space

Landsat's thermal camera passed over on a clear winter day, February 21, 2020. This spring's heat shows up from about 440 miles up. The brightest yellow marks the warmest ground, roughly 18°F warmer than the land around it.

Aerial view of the ground around Hot Springs On Upper Sour Creek Landsat thermal view of the same ground around Hot Springs On Upper Sour Creek
Aerial Thermal

Drag to compare. The view is about 2½ miles across, and each thermal pixel covers roughly 300 feet of ground, so individual pools blur into one warm patch.

Thermal: Landsat 8/9 surface temperature, USGS (public domain), via Microsoft Planetary Computer. Aerial: USGS The National Map. More springs seen from space.

Heat Below
120 milliwatts per square meter of heat flow

That's about twice the US average of 65. It's higher than at 71% 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
12°
Jan
14°
Feb
22°
Mar
27°
Apr
35°
May
45°
Jun
56°
Jul
56°
Aug
47°
Sep
32°
Oct
20°
Nov
11°
Dec
Annual Precip: 28.2 in Annual Snow: 143.0 in
Best Time to Visit
December Air 11°F · Water 194°F · +183° contrast
January Air 12°F · Water 194°F · +182° contrast
February Air 14°F · Water 194°F · +180° contrast
December offers 45°F more contrast than July
Current Conditions
26°F
N 0.0 mph 88% Good soaking weather
Today 56° Low 33° Sunny
Spring is +138° warmer
Wednesday 62° Low 37° Sunny 1% precip
Spring is +132° warmer
Thursday 60° Low 38° Showers And Thunderstorms 77% precip
Spring is +134° warmer
Friday 52° Low 32° Rain Showers Likely 62% precip
Spring is +142° warmer
Saturday 55° Low 32° Mostly Sunny then Chance Showers And Thunderstorms 31% precip
Spring is +139° warmer
Nearby Camping
Nearby Camping
Tower Fall Campground 14.7 mi away

Overview Tower Fall Campground—elevation 6,600 feet (2012 m)—is on the north side of the steep, winding, road to Dunraven Pass. The campground is near the Tower General Store and Tower Fall. The Lamar Valley, with spectacular wildlife viewing opportunities, is nearby as are several Day Hikes in the Tower and Northeast Area. Roosevelt Lodge, a short drive from the campground, offers dining and horseback riding. For reservations at the campgrounds managed by Yellowstone National Park Lodges (F...

Reservable Yes
Reserve on Recreation.gov →
High Altitude Advisory 8,585 ft

At 8,585 feet, Hot Springs On Upper Sour Creek is in high-altitude territory where the air is noticeably thinner. Soaking in hot water accelerates dehydration and can amplify altitude effects like headache and fatigue. UV radiation is roughly 34% stronger here. Wear sunscreen even on overcast days and take breaks from the water to rehydrate.

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Temperature
194°F
Warm Hot Boiling
Water Temp 194°F (90°C)
Avg Air Temp 32°F
Above Ambient +163°F
Great soaking conditions September
Access
Open
Road Access Backcountry
Nearest Road Grand Loop Road
Distance to Road 5.9 mi
Land
Ownership Federal
Agency National Park Service
Designation National Park
Unit Yellowstone National Park
Manager National Park Service
Protection 1 - Permanent protection, natural state
Frequently Asked Questions
What is the water temperature at Hot Springs On Upper Sour Creek?
Hot Springs On Upper Sour Creek has a water temperature of 194°F (90°C). This is considered a hot spring, well above body temperature.
Where is Hot Springs On Upper Sour Creek located?
Hot Springs On Upper Sour Creek is located in Gallatin County, Wyoming at 8,585 feet elevation, near West Yellowstone. Coordinates: 44.6810°N, 110.3260°W.
How do I get to Hot Springs On Upper Sour Creek?
Hot Springs On Upper Sour Creek has Backcountry road access, with the nearest road being Grand Loop Road (5.9 mi from the road).
Is Hot Springs On Upper Sour Creek free to visit?
Hot Springs On Upper Sour Creek has Open access. It is managed by National Park Service.
Can I camp near Hot Springs On Upper Sour Creek?
Yes, Tower Fall Campground is located nearby (14.7 miles away).
Is it safe to soak at Hot Springs On Upper Sour Creek?
No, not at the source. The water at Hot Springs On Upper Sour Creek reaches 194°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.