How Trail Access Works on National-Forest Land

Access is a designation, not a default

The National Forest System spans 154 national forests and 20 national grasslands, and this index covers the 110 of them across 39 states that carry bike-designated trail in the USFS dataset. On that land, trail access is not a blanket permission — it is a set of specific designations the managing forest makes for each route. A trail is open to a given use because the forest designated it for that use, and closed to another because it did not.

For conventional mountain bikes, the baseline is simple: bikes are a non-motorized use and may be ridden on trails open to them, except in designated Wilderness, where the Wilderness Act prohibits all mechanized travel including bicycles. For e-bikes, the framework is stricter because, on Forest Service land, an e-bike is legally a motor vehicle.

A trail is open because the forest designated it for that use — access is a designation, not a default.

The Travel Management Rule and the MVUM

Motorized access is governed by the Travel Management Rule (36 CFR Part 212, Subpart B). Each national forest is required to designate the roads, trails, and areas open to motor vehicles and to publish them on a Motor Vehicle Use Map (MVUM). If a route isn’t on the MVUM, motor-vehicle travel there is prohibited — and that includes e-bikes of every class.

This is the mechanism behind the recurring surprise for e-bike riders: a forest can have hundreds of miles of bike-legal singletrack and still show very few e-bike-designated trails, simply because those routes have not been added to the motorized system through travel analysis. The 27,763 miles of bike-designated trail in this index and the 16,403 Class 1 e-bike segments are tracked separately for exactly this reason.

How the data is designated — and where it comes from

The legality shown on this site comes from the USFS National Forest System Trails dataset (the EDW Trans_Trail_NFS_Publish layer), the Forest Service’s own published record of trails and their managed uses. Each trail carries managed-use fields that encode which uses are allowed and the season each use is open — for example a bike season written as 06/01–10/31. We read those fields verbatim and never infer an access we cannot cite.

That is also why some trails show a season rather than year-round access. High-country routes may be designated open to bikes only in summer and fall, both to protect wet spring tread and to separate uses like winter grooming. The season on record is part of the designation, not a suggestion.

Checking access before you ride

Work from the specific trail outward. Look up the trail’s own page to see its bike and per-class e-bike status and the season on record, then zoom out to the forest profile for the broader picture and a link to the managing ranger district. Where a trail shows no e-bike designation, the federal default governs: conventional bikes on non-motorized trails, no e-bikes.

Finally, verify locally. Published travel-management data is a point-in-time snapshot; forests issue orders that open or close routes between updates, seasonal and fire closures happen, and Wilderness boundaries are firm. Confirm current conditions with the managing ranger district before you go. This guide is informational and is not legal advice.