USFS National Forest System Trails · Colorado · Updated June 2026
San Juan National Forest Mountain Bike Trails
San Juan National Forest carries 1,931 mi of mapped National Forest System trail, of which 218 mi across 96 segments is designated for mountain bikes, typically open May–Nov. Class 1 e-bikes are designated on 226 segments (476 mi).
218 mi
Bike-designated
96 segments
1,931 mi
Total NFS trail
847 segments
476 mi
Class 1 e-bike
226 segments
9
ADA-accessible
trail segments
Trail surface
- Native Material799
- Snow38
- Crushed Aggregate Or Gravel6
- Concrete2
- Asphalt1
USFS trail class (1 = primitive · 5 = developed)
- Class 2432
- Class 3370
- Class 437
- Class 57
- Class 11
11% 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 |
|---|---|---|---|---|
| Little Bean Canyon | 11.8 | Native Material | 2 | Jun–Oct |
| Hermosa Creek | 9.58 | Native Material | 3 | Year-round |
| Pinkerton-Flagstaff | 7.63 | Native Material | 3 | May–Nov |
| Box Canyon | 6.79 | Native Material | 2 | Year-round |
| Willow Draw | 6.24 | Native Material | 2 | Year-round |
| Dutch Creek | 6.1 | Native Material | 3 | May–Nov |
| Treasure Mountain | 5.54 | Native Material | 2 | Year-round |
| Aspen Spur | 5.02 | Native Material | 2 | Year-round |
| Hermosa Creek | 4.92 | Native Material | 3 | Year-round |
| Rocky Canyon | 4.5 | Native Material | 2 | Year-round |
| Green Canyon | 4.47 | Native Material | 2 | Year-round |
| Blue Jay | 4.41 | Native Material | 2 | Apr–Nov |
| Baldy Loop | 4.38 | Native Material | 2 | Year-round |
| Bear Creek | 3.97 | Native Material | 2 | Year-round |
| Grindstone | 3.83 | Native Material | 3 | Year-round |
| Bedrock Creek Ohv Trail | 3.8 | Native Material | 3 | Year-round |
| Cutthroat | 3.68 | Native Material | 3 | May–Nov |
| First Notch 2 | 3.26 | Native Material | 2 | Year-round |
| Jones Creek | 3.16 | Native Material | 3 | May–Nov |
| Horizon Loop | 2.87 | Native Material | 2 | Year-round |
| Runlett Park | 2.76 | Native Material | 3 | Year-round |
| Sand Creek | 2.58 | Native Material | 2 | Year-round |
| First Notch 1 | 2.58 | Native Material | 2 | Year-round |
| Morrison | 2.54 | Native Material | 3 | Year-round |
| Clampett Mill | 2.52 | Native Material | 2 | Year-round |
E-bikes in San Juan National Forest
Class 1 on 226 segments · Class 2 on 226 · Class 3 on 226. See full e-bike rules for San Juan National Forest →
Frequently asked questions
- How many miles of mountain bike trail are in San Juan National Forest?
- San Juan National Forest has about 218 mi of bike-designated trail across 96 segments, out of 1,931 mi of total National Forest System trail.
- What is the riding season in San Juan National Forest?
- Most bike-designated trails in San Juan National Forest carry a May–Nov season in USFS data; higher-elevation trails clear later.
- Are e-bikes allowed in San Juan National Forest?
- Only where designated. Class 1 e-bikes are recorded on 226 segments. See the e-bike rules page for the class-by-class breakdown.
More Colorado national forests
Grand Mesa, Uncompahgre and Gunnison National Forests
1,618 mi bike trail
White River National Forest
868 mi bike trail
Pike and San Isabel National Forests
573 mi bike trail
Arapaho and Roosevelt National Forests
519 mi bike trail
Medicine Bow-Routt National Forest
134 mi bike trail
Rio Grande National Forest
0 mi bike trail
All Colorado mountain biking