4.8
(3090)
7,529
riders
Garnet Mountain Loop
02:11
18.1km
680m
Mountain biking
The Garnet Mountain Loop offers a demanding yet incredibly scenic mountain biking experience near Bozeman. You'll navigate a mix of forest service roads, ATV trails, and technical singletrack, with varied terrain that includes roots, rocks, and some seriously steep sections. The highlight is undoubtedly the panoramic views from the Garnet Mountain summit, especially from the historic fire lookout tower, which provides expansive vistas of the canyon and distant peaks.
This difficult 11.3-mile (18.1 km) route involves a substantial 2225 feet (678 metres) of elevation gain, typically taking around 2 hours and 10 minutes. It's best tackled between June and October due to snow conditions. Cell service can be unreliable in spots, so be sure to download your route and inform someone of your plans before you head out.
What sets this advanced mountain biking trail apart is its challenging nature and the rewarding views. The singletrack sections are free from motorcycles and ATVs, offering a more peaceful ride. The fire lookout tower, built in 1930, is a unique feature, and the trail is known for having one of the best downhills in the county, albeit a bit short.
Last updated: June 9, 2026
Tips
Your route passes through a protected area
Please check local regulations for:
Waypoints
Start point
Parking
Get Directions
8.61 km
Rat Lake
Highlight • Lake
Tip by
13.0 km
Garnet Mountain
Highlight • Summit
Tip by
18.0 km
Storm Castle Creek
Highlight • River
Tip by
18.1 km
End point
Parking
Way Types & Surfaces
Way Types
6.31 km
5.14 km
4.43 km
1.57 km
705 m
Surfaces
11.5 km
4.36 km
1.57 km
705 m
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Elevation
Highest point (2,320 m)
Lowest point (1,670 m)
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Weather
Powered by Foreca
Today
Wednesday 1 July
22°C
6°C
75 %
Additional weather tips
Max wind speed: 13.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
How difficult is the Garnet Mountain Loop for mountain biking?
This trail is generally rated as difficult to strenuous for mountain biking, often considered a Black Diamond difficulty with a 'Hard' physical rating. It features sustained, steep climbs and technical downhill singletrack, making it unsuitable for beginners.
What kind of terrain will I encounter on the trail?
You'll experience a mix of terrain. The ascent primarily uses forest service roads and ATV trails, which can be gravelly and loose, with some very steep sections. The downhill portion is about four miles of narrow singletrack with steep hillsides, technical corners, and occasional isolated technical spots. Watch for downed trees and constant sidehilling.
What scenic highlights can I expect along the route?
The trail offers 'killer views' throughout. You'll pass by beautiful natural features like Rat Lake and Storm Castle Creek. The singletrack provides beautiful vistas of the canyon, and near the summit of Garnet Mountain, you can enjoy panoramic 360-degree views of the Spanish Peaks, Gallatin Range, and Hyalite Ridge from the historic fire lookout.
When is the best time of year to ride the Garnet Mountain Loop?
The best conditions for riding are typically from June through October. The fall colors in this area are particularly beautiful, adding to the scenic experience.
Are permits or fees required for mountain biking in Custer Gallatin National Forest?
Generally, there are no specific permits required for day-use mountain biking on trails within the Custer Gallatin National Forest, including the Garnet Mountain Loop. However, it's always a good idea to check the official Custer Gallatin National Forest website for any current regulations or alerts before your visit.
Is the Garnet Mountain Loop dog-friendly?
Yes, the trail is generally dog-friendly. However, always ensure your dog is under control, preferably on a leash, and be mindful of wildlife and other trail users. Remember to pack out all waste.
Where can I park for the Garnet Mountain Loop?
The primary access point is typically the Storm Castle Trailhead. Parking is available there, but it's advisable to arrive early, especially on weekends, as it can fill up.
What should I know about the climbing sections on this trail?
Be prepared for a relentless and strenuous climb. Some sections are very steep and may require you to push your bike. Around mile seven, there's a particularly steep pitch where you might be searching for your 'granny gear.' The double-track climbing routes can be gravelly and loose.
What safety precautions should I take on the trail?
Given the presence of wildlife, it is highly recommended to carry bear spray. Also, be aware of other trail users, including pedestrians, and watch out for downed trees on the singletrack sections. Always ride within your skill level, especially on technical descents.
Can I stay overnight near the trail?
Yes, a significant highlight is the historic fire lookout tower at the summit of Garnet Mountain. This lookout can be rented for overnight stays, offering a unique backcountry experience. Reservations are typically required well in advance.
Does the trail intersect other well-known paths?
Yes, the route also passes through sections of the Rat Lake Trail, Garnet Mountain Trail, Rat Flat Camp Road, and Storm Castle Trail.
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