USFS National Forest System Trails · Caribou-Targhee National Forest · Idaho · Updated June 2026
Leaning Fir (USFS trail 4169) is a 1.8 mi trail in Caribou-Targhee National Forest, Idaho. Mountain bikes are designated as allowed, Apr–Dec, with Class 1 e-bikes also designated.
Can I bike Leaning Fir?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Apr–Dec |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Apr–Dec |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Apr–Dec |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Apr–Dec |
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
In Caribou-Targhee National Forest, Idaho, Leaning Fir (USFS trail 4169) covers 1.8 mi of National Forest System trail. Everything below comes straight from the US Forest Service National Forest System Trails dataset — length, surface, slope-derived difficulty, and the specific bike and e-bike designations on record — so you can check legality before you load up. The tread is mapped as native material. Its grade-based difficulty is Advanced (grade band +12-20%) — a steep steepness profile derived from USFS slope data, not a technical mountain-bike rating. Mountain bikes are allowed, with a Apr–Dec season in the data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Apr–Dec) — 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 Leaning Fir?
- Yes. Mountain bikes are designated as allowed on Leaning Fir in Caribou-Targhee National Forest, typically Apr–Dec, per USFS data.
- Are e-bikes allowed on Leaning Fir?
- Class 1, Class 2, Class 3 e-bikes are designated on Leaning Fir in the USFS data.
- How long is Leaning Fir?
- Leaning Fir measures about 1.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Leaning Fir?
- USFS data records the tread surface of Leaning Fir as native material.
- How difficult is Leaning Fir?
- 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 Caribou-Targhee National Forest (USFS trail geometry isn't mapped).
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