USFS National Forest System Trails · Montana · Updated June 2026
Custer Gallatin National Forest Mountain Bike Trails
Custer Gallatin National Forest carries 3,609 mi of mapped National Forest System trail, of which 1,847 mi across 1,218 segments is designated for mountain bikes, typically open Year-round. Class 1 e-bikes are designated on 625 segments (1,125 mi).
1,847 mi
Bike-designated
1,218 segments
3,609 mi
Total NFS trail
2,071 segments
1,125 mi
Class 1 e-bike
625 segments
13
ADA-accessible
trail segments
Trail surface
- Native Material1,994
- Snow37
- Asphalt13
- Imported Compacted Material13
- Crushed Aggregate Or Gravel3
USFS trail class (1 = primitive · 5 = developed)
- Class 3876
- Class 2809
- Class 4329
- Class 128
- Class 528
51% of this forest's mapped trail is bike-designated. Note: USFS records trail grade (steepness), not technical MTB difficulty — we surface grade where present but do not infer a black/blue/green rating from it.
Largest bike-designated trails
| Trail | Miles | Surface | Trail class | Bike season |
|---|---|---|---|---|
| Boone Peak | 10.22 | Native Material | 2 | Year-round |
| South Ash Creek | 8.22 | Native Material | 2 | Year-round |
| 41334 | 5.99 | Native Material | 2 | Year-round |
| Lake Of The Pines | 5.9 | Native Material | 4 | Year-round |
| Taylor-15mile Creek | 5.75 | Native Material | 2 | Year-round |
| Poker Jim N Fork Lee | 5.64 | Native Material | 2 | Year-round |
| Dead Horse Divide | 5.43 | Native Material | 2 | Jan–Oct, December |
| Shootout Park | 4.84 | Native Material | 4 | Year-round |
| Bridger Foothills | 4.62 | Native Material | 2 | Year-round |
| North Swan Divide | 4.29 | Native Material | 3 | Year-round |
| Mica Ridge | 4.1 | Native Material | 4 | Year-round |
| Middle Plum Cr | 3.75 | Native Material | 2 | Year-round |
| Porcupine Ibex | 3.49 | Native Material | 3 | Year-round |
| Sheep Lake | 3.46 | Native Material | 3 | Year-round |
| 47921 | 3.43 | Native Material | 2 | Year-round |
| Peterson Canyon | 3.32 | Native Material | 1 | Year-round |
| Shields Lowline | 3.24 | Native Material | 2 | Year-round |
| Pika Point | 3.07 | Native Material | 3 | Year-round |
| Albino Lake | 3.02 | Native Material | 3 | Year-round |
| North Fork Elk Creek | 2.9 | Native Material | 3 | Year-round |
| Wicked Creek | 2.89 | Native Material | 4 | Year-round |
| Coffin Lakes | 2.85 | Native Material | 3 | Year-round |
| Silver Run Plateau | 2.53 | Native Material | 3 | May–Oct |
| Logging Creek | 2.21 | Native Material | 2 | Year-round |
| Lemonade Road | 2.16 | Native Material | 2 | Year-round |
E-bikes in Custer Gallatin National Forest
Class 1 on 625 segments · Class 2 on 625 · Class 3 on 625. See full e-bike rules for Custer Gallatin National Forest →
Frequently asked questions
- How many miles of mountain bike trail are in Custer Gallatin National Forest?
- Custer Gallatin National Forest has about 1,847 mi of bike-designated trail across 1,218 segments, out of 3,609 mi of total National Forest System trail.
- What is the riding season in Custer Gallatin National Forest?
- Most bike-designated trails in Custer Gallatin National Forest carry a Year-round season in USFS data; higher-elevation trails clear later.
- Are e-bikes allowed in Custer Gallatin National Forest?
- Only where designated. Class 1 e-bikes are recorded on 625 segments. See the e-bike rules page for the class-by-class breakdown.