USFS National Forest System Trails · Caribou-Targhee National Forest · Idaho · Updated June 2026
Kelly Mountain (USFS trail 4289) is a 1.8 mi trail in Caribou-Targhee National Forest, Idaho. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Kelly Mountain?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Restricted | — |
| Class 2 e-bike (throttle, 20 mph) | Restricted | — |
| Class 3 e-bike (pedal-assist, 28 mph) | Restricted | — |
This trail carries an accessibility designation in the USFS record.
Zooming out: across Caribou-Targhee 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
Kelly Mountain (USFS trail 4289) is a 1.8 mi trail in Caribou-Targhee National Forest, Idaho. 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. USFS records list its surface as native material. Based on slope, this is a Easy trail (grade band +5-8%); that reflects gentle gradient and is not the same as a technical MTB difficulty rating. Bike use is designated as allowed year-round. 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 2 on the agency's 1-to-5 development scale, where 1 is the most primitive, minimally maintained tread and 5 is the most developed, and the record carries an accessibility designation for this trail. For day-of certainty on closures or seasonal orders, check directly with the ranger district, since this reflects the USFS data as of the latest refresh.
Frequently asked questions
- Can you mountain bike on Kelly Mountain?
- Yes. Mountain bikes are designated as allowed on Kelly Mountain in Caribou-Targhee National Forest, year-round, per USFS data.
- Are e-bikes allowed on Kelly Mountain?
- No e-bike class (1, 2 or 3) is designated on Kelly Mountain in the USFS data.
- How long is Kelly Mountain?
- Kelly Mountain measures about 1.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Kelly Mountain?
- USFS data records the tread surface of Kelly Mountain as native material.
- How difficult is Kelly Mountain?
- Its grade-based difficulty is Easy (grade band +5-8%), 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 Caribou-Targhee National Forest (USFS trail geometry isn't mapped).
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