USFS National Forest System Trails · Custer Gallatin National Forest · Montana · Updated June 2026
West Fork Rock Creek (USFS trail 1) is a 16.5 mi trail in Custer Gallatin National Forest, Montana. Mountain bikes are designated as allowed year-round, with Class 1 e-bikes also designated.
Can I bike West Fork Rock Creek?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jul–Sep |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jul–Sep |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jul–Sep |
Zooming out: across Custer Gallatin National Forest, 98% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In Custer Gallatin National Forest, Montana, West Fork Rock Creek (USFS trail 1) covers 16.5 mi of National Forest System trail. This profile summarizes what the official US Forest Service trail record says about riding it: how long the trail is, what it's built on, how steep the route grades out, and which forms of bike use the agency has designated. The tread is mapped as native material. USFS slope data puts it in the Advanced band (grade band +12-20%), meaning a steep climb — keep in mind this measures steepness, not trail technicality. Bike use is designated as allowed year-round. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Jul–Sep) — Class 1 being pedal-assist only, Classes 2 and 3 adding a throttle and higher assisted speed. The route is mapped as USFS Trail Class 3 on the agency's 1-to-5 development scale, where 1 is the most primitive, minimally maintained tread and 5 is the most developed. Because conditions, closures, and local orders change between data refreshes, confirm the current status with the managing ranger district before you ride.
Frequently asked questions
- Can you mountain bike on West Fork Rock Creek?
- Yes. Mountain bikes are designated as allowed on West Fork Rock Creek in Custer Gallatin National Forest, year-round, per USFS data.
- Are e-bikes allowed on West Fork Rock Creek?
- Class 1, Class 2, Class 3 e-bikes are designated on West Fork Rock Creek in the USFS data.
- How long is West Fork Rock Creek?
- West Fork Rock Creek measures about 16.5 mi in total, summed across its mapped National Forest System segments.
- What is the surface of West Fork Rock Creek?
- USFS data records the tread surface of West Fork Rock Creek as native material.
- How difficult is West Fork Rock Creek?
- Its grade-based difficulty is Advanced (grade band +12-20%), derived from USFS slope data. This reflects steepness, not technical mountain-bike difficulty.
How we read this data
Grade-based difficulty above is the USFS grade (route steepness), not a technical mountain-bike rating — a gentle-grade trail can still be rocky or technical, and vice versa. Bike and e-bike status come verbatim from the USFS managed-use fields for this trail; we never infer access we can't cite. See our methodology for how the dataset is built and what each field means.
Where it is
Approximate location of Custer Gallatin National Forest (USFS trail geometry isn't mapped).
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