USFS National Forest System Trails · Black Hills National Forest · South Dakota · Updated June 2026
Rimrock (USFS trail 79) is a 4.8 mi trail in Black Hills National Forest, South Dakota. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Rimrock?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | — | |
| Class 2 e-bike (throttle, 20 mph) | — | |
| Class 3 e-bike (pedal-assist, 28 mph) | — |
Zooming out: across Black Hills National Forest, 34% of rideable trail miles are open to mountain bikes — a Bike Access Grade of C.
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About this trail
Rimrock (USFS trail 79) runs 4.8 mi through Black Hills National Forest in South Dakota. 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. Underfoot, the trail is recorded as native material. Based on slope, this is a Advanced trail (grade band 12-20%); that reflects steep gradient and is not the same as a technical MTB difficulty rating. Mountain bikes are allowed, open year-round in the data. The agency lists no Class 1, 2 or 3 e-bike designation here; absent a local order to the contrary, that means e-bikes are not an allowed use on this trail. 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 Rimrock?
- Yes. Mountain bikes are designated as allowed on Rimrock in Black Hills National Forest, year-round, per USFS data.
- Are e-bikes allowed on Rimrock?
- No e-bike class (1, 2 or 3) is designated on Rimrock in the USFS data.
- How long is Rimrock?
- Rimrock measures about 4.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Rimrock?
- USFS data records the tread surface of Rimrock as native material.
- How difficult is Rimrock?
- 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 Black Hills National Forest (USFS trail geometry isn't mapped).
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