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USFS National Forest System Trails · Montana · Updated June 2026

Custer Gallatin National Forest Mountain Bike Trails

ABike Access Grade A — 98% of rideable miles open to bikes. How we grade

Custer Gallatin National Forest earns a Bike Access Grade of A: 98% of its rideable trail miles are open to mountain bikes, with Class-1 e-bike access on part of the network. Excellent — most rideable trail miles are open to mountain bikes, with Class-1 e-bike access too.

Custer Gallatin National Forest carries 3,609 mi of mapped National Forest System trail, of which 2,209 mi across 552 segments is designated for mountain bikes, typically open Year-round. Class 1 e-bikes are designated on 381 segments (1,378 mi).

Reviewed by CanIBikeHere Editorial Team · Updated
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What the USFS data shows for Custer Gallatin National Forest

Of the 3,609 mi of mapped trail in Custer Gallatin National Forest, 61% — 2,209 mi across 552 bike-designated segments — is open to mountain bikes in USFS travel-management data.

Tread is overwhelmingly native dirt: USFS lists native material on 1,994 of 2,061 surfaced segments (97%).

On the USFS difficulty rating, advanced is the most common designation here — 1,492 of 1,869 rated segments (80%) — across all uses, not bikes alone.

USFS records a year-round bike season for this forest, though 3 different season windows still appear on individual segments at higher elevation.

The longest single named bike segment in the data is Boone Peak at 23.29 mi on native dirt, rated advanced by USFS and open Year-round.

Class 1 e-bikes are designated on 381 segments (1,378 mi), and 5 segments carry an ADA-accessibility flag in the same dataset.

A
Bike Access Grade
98% of rideable miles bike-open
495
Ridable trails
with their own page
2,209 mi
Bike-designated
552 segments
3,609 mi
Total NFS trail
2,071 segments
1,378 mi
Class 1 e-bike
381 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

61% 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
Boone Peak23.29Native Material—Year-round
Bangtail Divide22.71Native Material—Year-round
West Fork Stillwater22.17Native Material—Year-round
Skyline20.82Native Material—Year-round
Bridger Foothills20.55Native Material—Year-round
Lightning Creek19.88Native Material—Year-round
Cinnamon Buck19.36Native Material—Year-round
Red Cub18.72Native Material—Year-round
Buck Ridge17.93Native Material—Year-round
Wicked Creek17.19Native Material—Year-round
Cherry Creek16.9Native Material—Year-round
Slough Creek16.58Native Material—May–Oct
West Fork Rock Creek16.5Native Material—Year-round
Bridger Ridge16.42Native Material—Year-round
Porcupine Ibex16.25Native Material—Year-round
Hellroaring Plateau16.15Native Material—Year-round
Buck Ridge (Snowmo)16Native Material——
Phantom Creek15.21Native Material—Year-round
Tucker Creek14.91Native Material—May–Oct
King Creek14.88Native Material—Year-round
Inspiration Divide14.87Native Material—Year-round
Bear Canyon14.53Native Material—Year-round
Red Lodge Creek14.45Native Material—Year-round
Bear Basin14.19Native Material—Year-round
Upsidedown Creek13.91Native Material—May–Oct

Every trail in Custer Gallatin National Forest

All 495 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 (31)

Gentle grade band (shallow average slope).

Intermediate grade (166)

Moderate grade band.

Advanced grade (218)

Steep grade band.

Grade not recorded (80)

No grade band recorded in the USFS data.

CSV

Custer Gallatin National Forest bike-legal trail list (CSV)

Download all 495 bike- and Class 1 e-bike-designated trails in Custer Gallatin National Forest — name, miles, surface, grade, season, and e-bike class per trail, straight from USFS data.

E-bikes in Custer Gallatin National Forest

Class 1 on 381 segments · Class 2 on 381 · Class 3 on 381. See full e-bike rules for Custer Gallatin National Forest →

Where it is

Approximate center of Custer Gallatin 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 Custer Gallatin National Forest?
Custer Gallatin National Forest earns a Bike Access Grade of A: 98% of its rideable trail miles are open to mountain bikes, with Class-1 e-bike access on part of the network. Excellent — most rideable trail miles are open to mountain bikes, with Class-1 e-bike access too.
How many miles of mountain bike trail are in Custer Gallatin National Forest?
Custer Gallatin National Forest has about 2,209 mi of bike-designated trail across 552 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 381 segments. See the e-bike rules page for the class-by-class breakdown.

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