USFS National Forest System Trails · Updated June 2026
Montana Mountain Bike Trails
Across 7 national forests in Montana, USFS data maps 4,846 mi of bike-designated trail on 1,236 segments, led by Custer Gallatin National Forest (2,209 mi). Class 1 e-bikes are designated on 879 segments.
National forests in Montana
| National forest | Bike miles | Total trail | Class 1 e-bike |
|---|---|---|---|
| Custer Gallatin National Forest | 2,209 mi | 3,609 mi | 381 |
| Helena-Lewis and Clark National Forest | 2,202 mi | 3,588 mi | 323 |
| Lolo National Forest | 182 mi | 2,334 mi | 77 |
| Kootenai National Forest | 120 mi | 1,820 mi | 30 |
| Flathead National Forest | 79.6 mi | 2,260 mi | 67 |
| Beaverhead-Deerlodge National Forest | 54.3 mi | 3,216 mi | 1 |
| 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 →
Browse by grade-based difficulty
Steepness bands derived from the USFS grade field — a slope measure, not a technical mountain-bike rating.
Top trails in Montana
The 30 longest ridable trails in Montana by mapped mileage. Each links to its full USFS data profile.
Montana bike-legal trail list (CSV)
Download every one of the 1,253 bike- and Class 1 e-bike-designated trails across Montana's national forests — miles, surface, grade, season, and e-bike class per trail, from official USFS data.
Frequently asked questions
- How many miles of national-forest mountain bike trail are in Montana?
- About 4,846 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 2,209 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 879 segments. See the Montana e-bike rules page.