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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

TrailMilesSurfaceTrail classBike season
Little Bean Canyon11.8Native Material2Jun–Oct
Hermosa Creek9.58Native Material3Year-round
Pinkerton-Flagstaff7.63Native Material3May–Nov
Box Canyon6.79Native Material2Year-round
Willow Draw6.24Native Material2Year-round
Dutch Creek6.1Native Material3May–Nov
Treasure Mountain5.54Native Material2Year-round
Aspen Spur5.02Native Material2Year-round
Hermosa Creek4.92Native Material3Year-round
Rocky Canyon4.5Native Material2Year-round
Green Canyon4.47Native Material2Year-round
Blue Jay4.41Native Material2Apr–Nov
Baldy Loop4.38Native Material2Year-round
Bear Creek3.97Native Material2Year-round
Grindstone3.83Native Material3Year-round
Bedrock Creek Ohv Trail3.8Native Material3Year-round
Cutthroat3.68Native Material3May–Nov
First Notch 23.26Native Material2Year-round
Jones Creek3.16Native Material3May–Nov
Horizon Loop2.87Native Material2Year-round
Runlett Park2.76Native Material3Year-round
Sand Creek2.58Native Material2Year-round
First Notch 12.58Native Material2Year-round
Morrison2.54Native Material3Year-round
Clampett Mill2.52Native Material2Year-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.