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USFS National Forest System Trails · Updated June 2026

Montana Mountain Bike Trails

Across 7 national forests in Montana, USFS data maps 3,940 mi of bike-designated trail on 2,611 segments, led by Custer Gallatin National Forest (1,847 mi). Class 1 e-bikes are designated on 1,491 segments.

3,940 mi
Bike-designated
2,611 segments
18,616 mi
Total NFS trail
7
National forests
2,623 mi
Class 1 e-bike
1,491 segments

National forests in Montana

National forestBike milesTotal trailClass 1 e-bike
Custer Gallatin National Forest1,847 mi3,609 mi625
Helena-Lewis and Clark National Forest1,684 mi3,588 mi555
Lolo National Forest166 mi2,334 mi101
Kootenai National Forest115 mi1,820 mi78
Flathead National Forest79.6 mi2,260 mi130
Beaverhead-Deerlodge National Forest48.9 mi3,216 mi2
Bitterroot National Forest0 mi1,790 mi0

E-bike rules in Montana

On Forest Service land e-bikes are motor vehicles, allowed only where designated. See Montana e-bike rules by class and forest →

Frequently asked questions

How many miles of national-forest mountain bike trail are in Montana?
About 3,940 mi of bike-designated trail across 7 national forests, from USFS travel-management data.
Which national forest has the most mountain biking in Montana?
Custer Gallatin National Forest, with about 1,847 mi of bike-designated trail.
Are e-bikes allowed in Montana national forests?
Only where designated — e-bikes are motor vehicles on Forest Service land. Class 1 access is recorded on 1,491 segments. See the Montana e-bike rules page.