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 forest | Bike miles | Total trail | Class 1 e-bike |
|---|---|---|---|
| Custer Gallatin National Forest | 1,847 mi | 3,609 mi | 625 |
| Helena-Lewis and Clark National Forest | 1,684 mi | 3,588 mi | 555 |
| Lolo National Forest | 166 mi | 2,334 mi | 101 |
| Kootenai National Forest | 115 mi | 1,820 mi | 78 |
| Flathead National Forest | 79.6 mi | 2,260 mi | 130 |
| Beaverhead-Deerlodge National Forest | 48.9 mi | 3,216 mi | 2 |
| Bitterroot National Forest | 0 mi | 1,790 mi | 0 |
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.