File:Lolo Hot Springs, Lolo, MT, 2011 1.jpg — cc0
Lolo Hot Springs registers 111°F with unusually alkaline water at pH 9.3 and very low mineral content, dominated by 52 mg/L sodium. Located at 4,324 feet in Missoula County, Montana, the spring sits 147 meters from Lolo Creek Road and requires a short walk to reach. The Salish name translates to "Steam on a Ridge Top."
The spring occupies the western reaches of Missoula County along the U.S. Highway 12 corridor near the Idaho border, at the foot of the Bitterroot Mountains. At 4,324 feet, the surrounding terrain is densely forested with mixed conifers and cut by Lolo Creek's drainage. Annual snowfall exceeds 10 feet, blanketing the valley from late fall through spring. The area receives over 30 inches of precipitation yearly, supporting thick understory growth along the creek bottoms.
History of Lolo Hot Springs, Granite Springs
The Salish people knew this site as smtt'm'cqi, meaning "Steam on a Ridge Top," indicating longstanding Indigenous recognition of the thermal activity. The springs developed into an unincorporated community featuring a commercial hot springs operation with a hotel and restaurant. Lolo Hot Springs marks the westernmost settlement along U.S. Highway 12 in Montana, serving as a waypoint on the historic Lolo Trail route.
Summer and early fall provide the most reliable access, as annual snowfall tops 121 inches and winter road conditions can be challenging along Highway 12. West Fork Butte Lookout, a reservable Forest Service cabin about 10 km away, serves as a base camp but requires vehicle access that closes December through May. Bring layers; average annual air temperature is just 42.8°F.
Is Lolo Hot Springs, Granite Springs worth visiting?
Best for
- Hot spring soaking
- Overnight camping trips
Lolo Hot Springs, Granite Springs is well suited for hot spring soaking and overnight camping trips.
Annual Precip: 30.2 in
Annual Snow: 121.3 in
December
Air 23°F · Water 111°F · +88° contrast
January
Air 26°F · Water 111°F · +85° contrast
February
Air 26°F · Water 111°F · +85° contrast
December offers 44°F more contrast than August
Recent Temperature
111.2°F
(44.0°C)
Measured Aug 15, 1974
The water at Lolo Hot Springs, Granite Springs is alkaline (pH 9.3).
pH influences mineral absorption through skin
May support bone density and joint health
Known for muscle relaxation and stress relief
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
Iron-rich springs may support circulation
Overview
West Fork Butte Lookout is an ideal place for guests to experience the mountains south of Missoula from a unique vantage point. The facility provides near-360-degree views of the surrounding area. It is equipped with basic supplies and provides guests a base camp location from which to explore the area. Access by vehicle is available for a relatively short time during the summer months and is variable during the spring and fall. From December 1 - May 1 Forest Road 37 is closed, requi...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Warm layers
Cold air before and after soaking
Camping gear
Nearby camping at West Fork Butte Lookout
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
0 miles from Frenchtown, MT
USGS Quad: LOLO HOT SPRINGS 7.5 · PP 492: 4.0 · NOAA: 1.0 · AMS Map: HAMILTON
What is the water temperature at Lolo Hot Springs, Granite Springs?
Lolo Hot Springs, Granite Springs has a water temperature of 111°F (44°C). This is considered a hot spring, well above body temperature.
Where is Lolo Hot Springs, Granite Springs located?
Lolo Hot Springs, Granite Springs is located in Missoula County, Montana at 4,324 feet elevation, near Frenchtown. Coordinates: 46.7280°N, 114.5330°W.
How do I get to Lolo Hot Springs, Granite Springs?
Lolo Hot Springs, Granite Springs has Short Walk road access, with the nearest road being Lolo Creek Road (482 ft from the road).
Can I camp near Lolo Hot Springs, Granite Springs?
Yes, West Fork Butte Lookout is located nearby (6.3 miles away).
What minerals are in the water at Lolo Hot Springs, Granite Springs?
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 9.3 (alkaline).
Is it safe to soak at Lolo Hot Springs, Granite Springs?
At 111°F, Lolo Hot Springs, Granite Springs is hot enough to require caution. Enter slowly, limit soaking sessions to 15–20 minutes, and stay hydrated. Access may be on private land or unconfirmed — verify current conditions before visiting. Always tell someone your plans before visiting remote hot springs.
Is Lolo Hot Springs, Granite Springs crowded?
Lolo Hot Springs, Granite Springs sees varying levels of visitors depending on the season and day of the week.
What should I bring to Lolo Hot Springs, Granite Springs?
Essentials for Lolo Hot Springs, Granite Springs: swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.