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USFS National Forest System Trails · Grade-based steepness · Updated June 2026

Intermediate Grade Mountain Bike Trails

USFS slope data places 2,521 ridable National Forest trails (7,805 mi total) in the Intermediate grade band — moderate average grades across 28 states. This is a steepness measure derived from the agency's GRADE field, not a technical mountain-bike difficulty rating.

2,521
Intermediate-grade trails
ridable segments
7,805 mi
Total trail
28
States covered
60
Listed below
longest trails
Grade is steepness, not technicality. A moderate gradient suggests sustained but manageable climbing and descending, yet the figure is purely about steepness: a trail can grade out moderate and still be loose, rocky, or root-strewn. We label these trails by the USFS GRADE field only and never translate it into a green/blue/black technical rating. Browse all ridable trails →

Longest intermediate-grade trails

The 60 longest trails in this grade band, by mapped mileage. Each links to its full USFS data profile.

TrailMilesSurfaceNational forestState
Great Western Trail145 miNative MaterialKaibab National ForestArizona
Continental Divide Trail103 miNative MaterialCarson National ForestNew Mexico
Pinhoti96.2 miNative MaterialChattahoochee-Oconee National ForestsGeorgia
Massanutten70.4 miNative MaterialGeorge Washington and Jefferson National ForestVirginia
Taconite Ohv61.7 miNative MaterialSuperior National ForestMinnesota
La Garita Sd.56.9 miNative MaterialRio Grande National ForestColorado
Gunflint Snowmobile49.4 miNative MaterialSuperior National ForestMinnesota
St. Joe Divide Nrt48.8 miNative MaterialIdaho Panhandle National ForestsIdaho
Stoneham Snomo34.3 miSnowWhite Mountain National ForestNew Hampshire
Mcct - Cad/Man31.4 miNative MaterialHuron-Manistee National ForestMichigan
Evans Notch Snomo Corr19/Its8030.2 miSnowWhite Mountain National ForestNew Hampshire
Dusy - Ershim29.1 miNative MaterialSierra National ForestCalifornia
Ozark Trail - Karkaghne28.7 miNative MaterialMark Twain National ForestMissouri
Boundary Trail27.8 miNative MaterialCaribou-Targhee National ForestIdaho
Wild Oak27.2 miNative MaterialGeorge Washington and Jefferson National ForestVirginia
Berryman Trail26.6 miNative MaterialMark Twain National ForestMissouri
Ozark Trail - Trace Creek25.7 miNative MaterialMark Twain National ForestMissouri
Ridge Stock Driveway25.3 miNative MaterialGrand Mesa, Uncompahgre and Gunnison National ForestsColorado
Crocker Pond Snomo24 miSnowWhite Mountain National ForestNew Hampshire
Ozark Trail - Middle Fork23.2 miNative MaterialMark Twain National ForestMissouri
Radial Mountain22.6 miNative MaterialMedicine Bow-Routt National ForestColorado
Fork Mountain Trail21.3 miNative MaterialMonongahela National ForestWest Virginia
Long Pond Snomo (Corr 19)21.2 miSnowWhite Mountain National ForestNew Hampshire
Monarch Crest-Cdnst21 miNative MaterialGrand Mesa, Uncompahgre and Gunnison National ForestsColorado
Stony Spur Atv20.7 miNative MaterialSuperior National ForestMinnesota
Albany Trail20.3 miNative MaterialMedicine Bow-Routt National ForestColorado
Continental Divide Trail20.2 miNative MaterialCaribou-Targhee National ForestIdaho
Pike Lake Loop20 miNative MaterialSuperior National ForestMinnesota
Cascade Loop20 miNative MaterialSuperior National ForestMinnesota
Timber-Frear Atv Loop19.4 miImported Compacted MaterialSuperior National ForestMinnesota
Allegheny Trail # 701a19.3 miNative MaterialMonongahela National ForestWest Virginia
Cedar Creek - South19.1 miNative MaterialMark Twain National ForestMissouri
Santa Cruz19 miNative MaterialLos Padres National ForestCalifornia
Palisade Plunge18.6 miNative MaterialGrand Mesa, Uncompahgre and Gunnison National ForestsColorado
Kilkenny Snomo18.5 miSnowWhite Mountain National ForestNew Hampshire
Bear River-Smith Fork17.5 miNative MaterialUinta-Wasatch-Cache National ForestUtah
Mcct - Little O Spur17.5 miNative MaterialHuron-Manistee National ForestMichigan
Casa Blanca17.3 miNative MaterialCoronado National ForestArizona
Indian Creek Cutoff16.3 miNative MaterialIdaho Panhandle National ForestsIdaho
Dry Creek15.6 miNative MaterialRio Grande National ForestColorado
Rocky Pond Snomo15 miSnowWhite Mountain National ForestNew Hampshire
King Creek14.9 miNative MaterialCuster Gallatin National ForestMontana
Clear Creek Trail14.8 miNative MaterialHumboldt-Toiyabe National ForestNevada
Devils Track Loop13.9 miNative MaterialSuperior National ForestMinnesota
Decoster13.6 miNative MaterialCaribou-Targhee National ForestIdaho
Mcct - Big O Spur13.6 miNative MaterialHuron-Manistee National ForestMichigan
Silver Fish Trail13.5 miNative MaterialAngeles National ForestCalifornia
Red Reef13.5 miNative MaterialLos Padres National ForestCalifornia
Ozark Trail Wappapello Section13.5 miNative MaterialMark Twain National ForestMissouri
West Elkhorn Foothills13.4 miNative MaterialCaribou-Targhee National ForestIdaho
Independence Creek Nrt13.4 miNative MaterialIdaho Panhandle National ForestsIdaho
Doubletop13.2 miNative MaterialGrand Mesa, Uncompahgre and Gunnison National ForestsColorado
Hubbard Brook Snomo12.9 miSnowWhite Mountain National ForestNew Hampshire
Excelsior12.8 miNative MaterialTahoe National ForestCalifornia
Ozark Trail - North Courtois12.8 miNative MaterialMark Twain National ForestMissouri
Ozark Trail - Courtois Creek12.8 miNative MaterialMark Twain National ForestMissouri
Mapleton-Sawmill Hollow12.7 miNative MaterialUinta-Wasatch-Cache National ForestUtah
Oracle Ridge12.6 miNative MaterialCoronado National ForestArizona
Swamp12.6 miNative MaterialSierra National ForestCalifornia
Bald Mountain12.6 miNative MaterialCaribou-Targhee National ForestIdaho

Intermediate-grade trails by state

How the 2,521 intermediate-grade trails break down across 28 states. Open a state for its full forest-by-forest data.

StateIntermediate-grade trailsMiles
Idaho5351,524 mi
California317851 mi
Nevada281431 mi
Montana228577 mi
Utah155419 mi
Arizona135605 mi
Oregon132156 mi
Colorado125615 mi
South Dakota113213 mi
Virginia84380 mi
Missouri68363 mi
New Hampshire55360 mi
Vermont40110 mi
Washington36109 mi
Minnesota32277 mi
Ohio3171.7 mi
New Mexico25175 mi
Indiana2154.9 mi
West Virginia19101 mi
Arkansas1954.4 mi
Michigan1697.1 mi
North Carolina1635.7 mi
Wyoming1439.6 mi
Georgia13139 mi
Alabama639.6 mi
Alaska24.2 mi
Kentucky21 mi
Nebraska11.3 mi

Frequently asked questions

What does "Intermediate" grade mean for a mountain bike trail?
It means the trail falls in a moderate grade band of the USFS GRADE field — moderate average grades. It describes how steep the route is, not how technical it is to ride; a intermediate-grade trail can still be smooth or rough depending on its surface.
How many national forest trails are Intermediate grade?
About 2,521 ridable trails (7,805 mi of trail) across 28 states fall in the Intermediate grade band in the current USFS data.
Is USFS grade the same as a green/blue/black difficulty rating?
No. USFS records a slope-based grade band, not the green/blue/black technical scale you see on trail-system maps. We surface the grade honestly and never infer a technical rating from it.

Other grade bands

Easy grade trailsAdvanced grade trailsExpert grade trailsAll ridable trails