Sherman Crater Fumaroles

Whatcom County, Washington · Near Peaceful Valley
48.7700°N, 121.8130°W · 9,463 ft
266°F 46°F air · Good soaking weather 9,463 ft Open Hike US Forest Service Camping nearby (6.6 mi)
Fumarole: Not a Soaking Spring

Sherman Crater Fumaroles is a fumarole, not a traditional hot spring. These geothermal features can be extremely dangerous. Boiling water, toxic gases, and unstable ground are common hazards. Do not attempt to soak.

Sherman Crater is a steam field on Mt. Baker National Forest land in Whatcom County, Washington. The temperature given is well above the boiling point of water. Peaceful Valley, twenty-odd miles off, is the town the record names. Open access is recorded, but this is a climb, and the record counts it as thermal because of the vents and for no other reason.

Location
26 miles from Sedro-Woolley, WA

About four miles on foot from Middle Fork Nooksack Road, at nearly nine and a half thousand feet. The climate record is extreme, with an average temperature well below freezing and a snowfall figure north of four hundred inches. Precipitation is well over a hundred inches. Forest Service ground in a national forest, with nothing recorded about a fee.

Boulder Creek Campground is roughly six and a half miles off, the camping the record gives. December through February sit on record as the best months; at this altitude and snowfall that is not a recommendation. Steam above boiling. Stay clear of the vents entirely. Mountaineering skill and a weather window are the real prerequisites here.

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 Sherman Crater Fumaroles.

Aerial view of the ground around Sherman Crater Fumaroles LiDAR bare-earth view of the same ground around Sherman Crater Fumaroles
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
Canyon floor
Steep ground climbs away on both sides of the spring.
Highest ground nearby
686 ft above the spring
Within a quarter mile, to the north
Cross-section through the spring

A slice through the ground from southwest to northeast, about 0.6 miles end to end.

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

Heat Below
79 milliwatts per square meter of heat flow

That's close to the US average of 65. It's higher than at 14% 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
Jan
Feb
10°
Mar
15°
Apr
24°
May
29°
Jun
36°
Jul
38°
Aug
31°
Sep
21°
Oct
11°
Nov
Dec
Annual Precip: 114.9 in Annual Snow: 447.1 in
Best Time to Visit
February Air 6°F · Water 266°F · +260° contrast
December Air 6°F · Water 266°F · +260° contrast
January Air 7°F · Water 266°F · +259° contrast
February offers 32°F more contrast than August
Current Conditions
46°F
Good soaking weather
Tuesday 38° Low 32° Chance Light Snow 26% precip
Spring is +228° warmer
Wednesday 46° Low 30° Sunny
Spring is +220° warmer
Thursday 47° Low 36° Sunny
Spring is +219° warmer
Friday 46° Low 35° Sunny
Spring is +220° warmer
Saturday 46° Low 36° Mostly Sunny 1% precip
Spring is +220° warmer
Where to Stay

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Nearby Camping
Boulder Creek Campground 6.6 mi away

Overview Boulder Creek Campground sits along the banks of Boulder Creek in the stunning Mt. Baker-Snoqualmie National Forest. The unique setting offers many recreational activities and scenic views. Baker Lake is close by, and several hiking trails and climbing routes are within a short driving distance.Recreation The surrounding area is a prime location for hiking, climbing, boating, fishing, picnicking and horseback riding in summer and early fall, and snowmobiling in the winter months....

Reservable Yes
Reserve on Recreation.gov →
High Altitude Advisory 9,463 ft

At 9,463 feet, Sherman Crater Fumaroles 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 38% stronger here. Wear sunscreen even on overcast days and take breaks from the water to rehydrate.

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Temperature
266°F
Warm Hot Boiling
Water Temp 266°F (130°C)
Avg Air Temp 20°F
Above Ambient +247°F
Access
Open
Road Access Hike
Nearest Road Middle Fork Nooksack Road
Distance to Road 4.3 mi
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Mt. Baker National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at Sherman Crater Fumaroles?
Sherman Crater Fumaroles has a water temperature of 266°F (130°C). This is considered a hot spring, well above body temperature.
Where is Sherman Crater Fumaroles located?
Sherman Crater Fumaroles is located in Whatcom County, Washington at 9,463 feet elevation, near Peaceful Valley. Coordinates: 48.7700°N, 121.8130°W.
How do I get to Sherman Crater Fumaroles?
Sherman Crater Fumaroles has Hike road access, with the nearest road being Middle Fork Nooksack Road (4.3 mi from the road).
Is Sherman Crater Fumaroles free to visit?
Sherman Crater Fumaroles has Open access. It is managed by US Forest Service.
Can I camp near Sherman Crater Fumaroles?
Yes, Boulder Creek Campground is located nearby (6.6 miles away).
Is it safe to soak at Sherman Crater Fumaroles?
No, not at the source. The water at Sherman Crater Fumaroles reaches 266°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.