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USFS National Forest System Trails · Colorado · Updated June 2026

San Juan National Forest Mountain Bike Trails

CBike Access Grade C — 29% of rideable miles open to bikes. How we grade

San Juan National Forest earns a Bike Access Grade of C: 29% of its rideable trail miles are open to mountain bikes, with Class-1 e-bike access on part of the network. Mixed — bikes are open on a meaningful share of rideable trails, but many are e-bike-only or discouraged.

San Juan National Forest carries 1,931 mi of mapped National Forest System trail, of which 218 mi across 61 segments is designated for mountain bikes, typically open May–Nov. Class 1 e-bikes are designated on 131 segments (563 mi).

Reviewed by CanIBikeHere Editorial Team · Updated
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What the USFS data shows for San Juan National Forest

Of the 1,931 mi of mapped trail in San Juan National Forest, 11% — 218 mi across 61 bike-designated segments — is open to mountain bikes in USFS travel-management data.

Tread is overwhelmingly native dirt: USFS lists native material on 799 of 847 surfaced segments (94%).

On the USFS difficulty rating, advanced is the most common designation here — 537 of 845 rated segments (64%) — across all uses, not bikes alone.

The headline bike season runs May–Nov; individual segments vary, with 5 distinct season windows recorded across the sampled bike trails.

The longest single named bike segment in the data is Aspen Loop at 33.77 mi on native dirt, rated advanced by USFS.

Class 1 e-bikes are designated on 131 segments (563 mi), and 9 segments carry an ADA-accessibility flag in the same dataset.

C
Bike Access Grade
29% of rideable miles bike-open
165
Ridable trails
with their own page
218 mi
Bike-designated
61 segments
1,931 mi
Total NFS trail
847 segments
563 mi
Class 1 e-bike
131 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
Aspen Loop33.77Native Material——
Turkey Creek19.7Native Material——
Hermosa Creek19.4Native Material——
Sand Creek14.91Native Material——
Bear Creek14.03Native Material——
Piedra Stock Dr13.94Native Material——
Calico South12.53Native Material——
Sage Hen Loop12.48Native Material—May–Dec
Little Bean Canyon11.8Native Material—Jun–Oct
Morrison11.65Native Material——
Stoner Mesa11.44Native Material—Jun–Oct
West Mancos11.22Native Material——
Blackhawk - Co.Trail11.01Native Material—Jun–Oct
Boggy Lower Loop10.9Native Material——
Boggy Upper Loop9.55Native Material——
Devil Mountain8.74Native Material——
Pinkerton-Flagstaff8.71Native Material——
Mcphee Overlook8.65Native Material—May–Nov
Treasure Mountain8.57Native Material——
Boggy8.51Native Material—Jun–Oct
Shush Bekeeh8.49Native Material—Jun–Oct
Mule Mountain8.48Native Material——
Lost Chicken8.38Native Material—Apr–Nov
Cascade Creek8.1Native Material——
Priest Gulch7.89Native Material——

Every trail in San Juan National Forest

All 165 ridable trails in this forest — every trail where USFS data designates mountain-bike or Class 1 e-bike use, grouped by grade-based steepness. Grade reflects slope, not technical difficulty. Each trail links to its full data profile.

Easy grade (84)

Gentle grade band (shallow average slope).

Intermediate grade (25)

Moderate grade band.

Advanced grade (55)

Steep grade band.

Grade not recorded (1)

No grade band recorded in the USFS data.

CSV

San Juan National Forest bike-legal trail list (CSV)

Download all 165 bike- and Class 1 e-bike-designated trails in San Juan National Forest — name, miles, surface, grade, season, and e-bike class per trail, straight from USFS data.

E-bikes in San Juan National Forest

Class 1 on 131 segments · Class 2 on 131 · Class 3 on 131. See full e-bike rules for San Juan National Forest →

Where it is

Approximate center of San Juan National Forest. USFS trail geometry isn't mapped here — use the ranger district for trailheads.

Frequently asked questions

What is the bike access grade for San Juan National Forest?
San Juan National Forest earns a Bike Access Grade of C: 29% of its rideable trail miles are open to mountain bikes, with Class-1 e-bike access on part of the network. Mixed — bikes are open on a meaningful share of rideable trails, but many are e-bike-only or discouraged.
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 61 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 131 segments. See the e-bike rules page for the class-by-class breakdown.

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Where to stay near San Juan National Forest

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