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Updated October 2026

Custer Gallatin National Forest Mountain Bike Trails

Mountain bike

2,189mi

designated on 550 segments

61% of mapped trail

E-bike

1,361miClass 1

designated on 380 segments

38% of mapped trail

Mountain bike

2,189mi

designated on 550 segments

61% of mapped trail

Season on record
Year-round
Bike Access Grade
A99% of rideable miles open to bikes. How we grade

E-bike

1,361miClass 1

designated on 380 segments

  • Class 11,361 mi
  • Class 21,361 mi
  • Class 31,361 mi

Treated as a motor vehicle: ridden only where designated.

Ridable trails
492
Mapped trail
3,612 mi on 2,090 segments

Both lanes share one scale: the 3,612 mi of National Forest System trail mapped in Custer Gallatin National Forest, Montana. From USFS National Forest System Trails records, updated October 2026.

Custer Gallatin National Forest earns a Bike Access Grade of A: 99% 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 3,612 mi of mapped National Forest System trail, of which 2,189 mi across 550 segments is designated for mountain bikes, typically open Year-round. Class 1 e-bikes are designated on 380 segments (1,361 mi).

Reviewed by CanIBikeHere Editorial Team · Updated
Where to stay near Custer Gallatin National Forest →

What the USFS data shows for Custer Gallatin National Forest

Of the 3,612 mi of mapped trail in Custer Gallatin National Forest, 61% — 2,189 mi across 550 bike-designated segments — is open to mountain bikes in USFS travel-management data.

Tread is overwhelmingly native dirt: USFS lists native material on 2,014 of 2,081 surfaced segments (97%).

On the USFS difficulty rating, advanced is the most common designation here — 1,515 of 1,889 rated segments (80%) — across all uses, not bikes alone.

USFS records a year-round bike season for this forest, though 4 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 380 segments (1,361 mi), and 5 segments carry an ADA-accessibility flag in the same dataset.

Trail surface

  • Native Material2,014
  • Snow37
  • Asphalt13
  • Imported Compacted Material13
  • Crushed Aggregate Or Gravel3

USFS trail class (1 = primitive · 5 = developed)

  • Class 3870
  • Class 2818
  • Class 4350
  • Class 528
  • Class 124

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

TrailMiles
Boone PeakNative MaterialYear-round23.29
Bangtail DivideNative MaterialYear-round22.71
West Fork StillwaterNative MaterialYear-round22.17
SkylineNative MaterialYear-round20.82
Bridger FoothillsNative MaterialYear-round20.55
Lightning CreekNative MaterialYear-round19.88
Mount MauriceNative MaterialYear-round19.36
Red CubNative MaterialYear-round18.72
Line Creek PlateauNative MaterialYear-round17.93
Wicked CreekNative MaterialYear-round17.19
Cherry CreekNative MaterialYear-round16.9
Slough CreekNative MaterialMay–Oct16.58
West Fork Rock CreekNative MaterialYear-round16.5
Bridger RidgeNative MaterialYear-round16.42
Porcupine IbexNative MaterialYear-round16.25
Hellroaring PlateauNative MaterialYear-round16.15
Phantom CreekNative MaterialYear-round15.21
Tucker CreekNative MaterialYear-round14.91
King CreekNative MaterialYear-round14.88
Inspiration DivideNative MaterialYear-round14.87
Bear CanyonNative MaterialYear-round14.53
Red Lodge CreekNative MaterialYear-round14.45
Bear BasinNative MaterialYear-round14.19
Telephone BasinNative MaterialYear-round13.96
Upsidedown CreekNative MaterialYear-round13.91

Every trail in Custer Gallatin National Forest

All 492 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).

  • Summit Divide10.6 mi
    Native Material, class 1bike + e-bike
  • First Yellow Mule7.1 mi
    Native Material, class 3bike
  • Dead Horse Divide5.4 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Devils Canyon5.4 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Horse Creek5.1 mi
    Native Material, class 2bike + e-bike
  • Iron Spring5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Lampkin Gulch5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Pot Hole4.5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Roberts Creek4.5 mi
    Native Material, class 2bike + e-bike
  • 315033.4 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Peterson Canyon3.3 mi
    Native Material, class 1bike + e-bike
  • Hoag Coal Mine Draw2.9 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Sheep Creek Basin2.7 mi
    Native Material, class 2bike
  • Deadhorse2.7 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Boundary Reservoir2.6 mi
    Native Material, class 2bike + e-bike
  • 3150102.5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • 311332.5 mi
    Native Material, class 1bike + e-bike
  • Johnny Pocket Spring2.5 mi
    Native Material, class 1bike + e-bike
  • South Fork American Fork2.4 mi
    Native Material, class 2bike
  • 315072.3 mi
    Native Material, class 1bike + e-bike
  • Ten Fifteen Mile2.3 mi
    Native Material, class 2bike + e-bike
  • 305112 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • 31503b2 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • 3111 Box Springs1.9 mi
    Native Material, class 1bike + e-bike
  • Mcclary Road1.9 mi
    Native Material, class 1, Jan–Oct, Decemberbike + e-bike
  • Lower Lake Fork1.7 mi
    Native Material, class 3bike
  • Ana Spring1.6 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Halbert Gulch Crossover1.5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • 316021.3 mi
    Native Material, class 1bike + e-bike
  • Ward Gulch1.3 mi
    Native Material, class 1bike + e-bike
  • 315040.6 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike

Intermediate grade (166)

Moderate grade band.

  • King Creek14.9 mi
    Native Material, class 2bike + e-bike
  • Pumpkin-Otter Divide11.9 mi
    Native Material, class 2bike + e-bike
  • Bridge Canyon10.1 mi
    Native Material, class 2bike + e-bike
  • Yellowstone Shortline8.9 mi
    Asphalt, class 5bike
  • Paget Creek8.9 mi
    Native Material, class 2bike + e-bike
  • Shootout Park8.8 mi
    Native Material, class 4bike
  • South Ash Creek8.2 mi
    Native Material, class 2bike + e-bike
  • Indian Taylor Cr Divide7.9 mi
    Native Material, class 2bike + e-bike
  • 413387.6 mi
    Native Material, class 2Class 1 e-bike
  • Horse Creek Butte7.2 mi
    Native Material, class 2bike + e-bike
  • N.Fk.Bloom Creek6.9 mi
    Native Material, class 2bike + e-bike
  • Yager6.5 mi
    Native Material, class 2bike + e-bike
  • Schoolhouse Draw6.4 mi
    Native Material, class 2bike + e-bike
  • Cub Creek6.2 mi
    Native Material, class 2bike + e-bike
  • Lyon Creek6.1 mi
    Native Material, class 2bike + e-bike
  • 413346 mi
    Native Material, class 2bike + e-bike
  • Taylor-15mile Creek5.8 mi
    Native Material, class 2bike + e-bike
  • South Plum Creek5.7 mi
    Native Material, class 2bike + e-bike
  • Poker Jim N Fork Lee5.6 mi
    Native Material, class 2bike + e-bike
  • Beattie Gulch5.6 mi
    Native Material, class 3bike
  • Brewster Divide5.4 mi
    Native Material, class 2bike + e-bike
  • 4432k5.4 mi
    Native Material, class 2bike + e-bike
  • O'Dell Divide5.2 mi
    Native Material, class 2bike + e-bike
  • Stag Rock5.1 mi
    Native Material, class 2bike + e-bike
  • Ash Creek5 mi
    Native Material, class 2bike + e-bike
  • Wickham Gulch5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • 409524.9 mi
    Native Material, class 2bike + e-bike
  • Plum Cr4.9 mi
    Native Material, class 2bike + e-bike
  • 479514.6 mi
    Native Material, class 2bike + e-bike
  • Liscom Butte West4.6 mi
    Native Material, class 2bike + e-bike
  • 409454.4 mi
    Native Material, class 2bike + e-bike
  • Maverick Cr4.3 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • Lower Plum Cr4.3 mi
    Native Material, class 2bike + e-bike
  • 477924.3 mi
    Native Material, class 2bike + e-bike
  • Mason Prong4.2 mi
    Native Material, class 2bike + e-bike
  • Coal Cr3.8 mi
    Native Material, class 2bike + e-bike
  • 477043.8 mi
    Native Material, class 2Class 1 e-bike
  • Wild Hog Butte3.8 mi
    Native Material, class 2bike + e-bike
  • Middle Plum Cr3.8 mi
    Native Material, class 2bike + e-bike
  • Taylor Divide3.6 mi
    Native Material, class 2bike + e-bike
  • Tooley Divide3.5 mi
    Native Material, class 2bike + e-bike
  • 413363.5 mi
    Native Material, class 2bike + e-bike
  • 479213.4 mi
    Native Material, class 2bike + e-bike
  • 479823.2 mi
    Native Material, class 2bike + e-bike
  • Cook Creek3.2 mi
    Native Material, class 2bike + e-bike
  • N.Fork Taylor Creek3.2 mi
    Native Material, class 2bike + e-bike
  • 478533.1 mi
    Native Material, class 2bike + e-bike
  • Newell Creek3 mi
    Native Material, class 2bike + e-bike
  • 479323 mi
    Native Material, class 2bike + e-bike
  • 450213 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 479423 mi
    Native Material, class 2bike + e-bike
  • Coffin Lakes2.9 mi
    Native Material, class 3bike
  • Brian Creek2.9 mi
    Native Material, class 2bike + e-bike
  • Coalmine Proj Rd2.8 mi
    Native Material, class 2bike + e-bike
  • 4094102.8 mi
    Native Material, class 2bike + e-bike
  • 480582.6 mi
    Native Material, class 2Class 1 e-bike
  • 443712.6 mi
    Native Material, class 2bike + e-bike
  • 440942.6 mi
    Native Material, class 2Class 1 e-bike
  • 47992.5 mi
    Native Material, class 2bike + e-bike
  • 444012.5 mi
    Native Material, class 2bike + e-bike
  • 421252.5 mi
    Native Material, class 2bike + e-bike
  • Bell Tower Divide2.5 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • South Fork Bozeman Creek2.5 mi
    Native Material, class 4bike
  • 478462.4 mi
    Native Material, class 2bike + e-bike
  • Fly Creek2.4 mi
    Native Material, class 2bike + e-bike
  • Griffin Pass2.4 mi
    Native Material, class 2bike + e-bike
  • 4094122.3 mi
    Native Material, class 2bike + e-bike
  • 478572.3 mi
    Native Material, class 2bike + e-bike
  • Flathers2.3 mi
    Native Material, class 2, Jan–Oct, Decemberbike + e-bike
  • 4776b2.3 mi
    Native Material, class 2bike + e-bike
  • 4785612.3 mi
    Native Material, class 2bike + e-bike
  • Logging Creek2.2 mi
    Native Material, class 2bike + e-bike
  • Lemonade Road2.2 mi
    Native Material, class 2bike + e-bike
  • Three & Ten Mile Divide2.1 mi
    Native Material, class 2bike + e-bike
  • 478652.1 mi
    Native Material, class 2bike + e-bike
  • 4432i2.1 mi
    Native Material, class 2bike + e-bike
  • 479542.1 mi
    Native Material, class 2bike + e-bike
  • 441912.1 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 476962.1 mi
    Native Material, class 2bike + e-bike
  • Daily Creek2 mi
    Native Material, class 2bike + e-bike
  • Cabin Creek2 mi
    Native Material, class 2bike + e-bike
  • 402322 mi
    Native Material, class 2bike + e-bike
  • 480122 mi
    Native Material, class 2bike + e-bike
  • 443111.9 mi
    Native Material, class 2bike + e-bike
  • 478541.9 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 446011.9 mi
    Native Material, class 2bike + e-bike
  • 4094111.8 mi
    Native Material, class 2bike + e-bike
  • Crevice Creek1.8 mi
    Native Material, class 3bike
  • Bridge Creek1.8 mi
    Native Material, class 2bike + e-bike
  • 4432d1.8 mi
    Native Material, class 2bike + e-bike
  • 450141.8 mi
    Native Material, class 2bike + e-bike
  • 451611.8 mi
    Native Material, class 2bike + e-bike
  • Doonan Draw1.8 mi
    Native Material, class 2bike + e-bike
  • 412771.8 mi
    Native Material, class 2bike + e-bike
  • 400121.8 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 476711.8 mi
    Native Material, class 2bike + e-bike
  • 450151.8 mi
    Native Material, class 2bike + e-bike
  • 409471.7 mi
    Native Material, class 2bike + e-bike
  • 478411.7 mi
    Native Material, class 2bike + e-bike
  • 470321.6 mi
    Native Material, class 2bike + e-bike
  • 4776d1.6 mi
    Native Material, class 2bike + e-bike
  • Brown Cow1.6 mi
    Native Material, class 2bike + e-bike
  • 470351.6 mi
    Native Material, class 2bike + e-bike
  • Ibex1.5 mi
    Native Material, class 3bike + e-bike
  • Fort Howes Comm Site1.5 mi
    Native Material, class 2bike + e-bike
  • 477211.5 mi
    Native Material, class 2bike + e-bike
  • 4779221.5 mi
    Native Material, class 2bike + e-bike
  • Ridge Road1.5 mi
    Native Material, class 2bike + e-bike
  • 409271.5 mi
    Native Material, class 2bike + e-bike
  • 479531.5 mi
    Native Material, class 2bike + e-bike
  • 443231.5 mi
    Native Material, class 2bike + e-bike
  • 478611.4 mi
    Native Material, class 2bike + e-bike
  • 4436b1.4 mi
    Native Material, class 2bike + e-bike
  • 478331.4 mi
    Native Material, class 2bike + e-bike
  • 441121.3 mi
    Native Material, class 2bike + e-bike
  • 478321.3 mi
    Native Material, class 2bike + e-bike
  • Wolverine Pass Cutoff1.2 mi
    Native Material, class 2bike
  • 413331.2 mi
    Native Material, class 2bike + e-bike
  • 477821.2 mi
    Native Material, class 2bike + e-bike
  • 44372a1.2 mi
    Native Material, class 2bike + e-bike
  • 4703311.2 mi
    Native Material, class 2bike + e-bike
  • 4432f1.2 mi
    Native Material, class 2bike + e-bike
  • 479721.2 mi
    Native Material, class 2bike + e-bike
  • 445021.2 mi
    Native Material, class 2bike + e-bike
  • Jackson Divide1.1 mi
    Native Material, class 4bike + e-bike
  • Wilbur Creek1.1 mi
    Native Material, class 2bike + e-bike
  • 479021.1 mi
    Native Material, class 2bike + e-bike
  • 478421 mi
    Native Material, class 2bike + e-bike
  • 4432c1 mi
    Native Material, class 2bike + e-bike
  • 480141 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • Liscom Butte Lookout1 mi
    Native Material, class 2bike + e-bike
  • 443511 mi
    Native Material, class 2bike + e-bike
  • 478561 mi
    Native Material, class 2bike + e-bike
  • 443221 mi
    Native Material, class 2bike + e-bike
  • South Fork Poker Jim0.9 mi
    Native Material, class 2bike + e-bike
  • Drop Tube0.9 mi
    Native Material, class 2bike + e-bike
  • 477810.9 mi
    Native Material, class 2bike + e-bike
  • 409550.9 mi
    Native Material, class 2bike + e-bike
  • 478520.8 mi
    Native Material, class 2bike + e-bike
  • 409290.8 mi
    Native Material, class 2bike + e-bike
  • 450230.8 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 480940.8 mi
    Native Material, class 2bike + e-bike
  • 443740.8 mi
    Native Material, class 2bike + e-bike
  • 4436a0.8 mi
    Native Material, class 2bike + e-bike
  • Pond Road0.7 mi
    Native Material, class 2bike + e-bike
  • 445010.7 mi
    Native Material, class 2bike + e-bike
  • Upper South Fork0.7 mi
    Native Material, class 2bike + e-bike
  • 409250.7 mi
    Native Material, class 2bike + e-bike
  • 470330.7 mi
    Native Material, class 2bike + e-bike
  • 478480.7 mi
    Native Material, class 2bike + e-bike
  • 400110.7 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 409440.6 mi
    Native Material, class 2bike + e-bike
  • 4436d0.6 mi
    Native Material, class 2bike + e-bike
  • 443720.6 mi
    Native Material, class 2bike + e-bike
  • 470360.6 mi
    Native Material, class 2bike + e-bike
  • 450220.6 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 478550.6 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 45030.6 mi
    Native Material, class 2bike + e-bike
  • 4432s0.6 mi
    Native Material, class 2bike + e-bike
  • 403220.6 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 409530.6 mi
    Native Material, class 2bike + e-bike
  • 441920.5 mi
    Native Material, class 2, Jan–Aug, Decemberbike + e-bike
  • 409460.5 mi
    Native Material, class 2bike + e-bike
  • 413190.5 mi
    Native Material, class 2bike + e-bike
  • 442100.5 mi
    Native Material, class 2bike + e-bike
  • 409430.5 mi
    Native Material, class 2bike + e-bike

Advanced grade (216)

Steep grade band.

Grade not recorded (79)

No grade band recorded in the USFS data.

CSV

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

Download all 492 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 380 segments · Class 2 on 380 · Class 3 on 380. 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: 99% 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 2,189 mi of bike-designated trail across 550 segments, out of 3,612 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 380 segments. See the e-bike rules page for the class-by-class breakdown.

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