USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
Keyser Ridge Loop (USFS trail 140) is a 1.8 mi trail in Arapaho and Roosevelt National Forests, Colorado. Mountain bikes are designated as allowed, Jun–Nov, with Class 1 e-bikes also designated.
Can I bike Keyser Ridge Loop?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Jun–Nov |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jun–Nov |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jun–Nov |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jun–Nov |
Zooming out: across Arapaho and Roosevelt National Forests, 99% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
Keyser Ridge Loop (USFS trail 140) is a 1.8 mi trail in Arapaho and Roosevelt National Forests, Colorado. 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. USFS slope data puts it in the Easy band (grade band +5-8%), meaning a gentle climb — keep in mind this measures steepness, not trail technicality. Mountain bikes are allowed, with a Jun–Nov season in the data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Jun–Nov) — 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 Keyser Ridge Loop?
- Yes. Mountain bikes are designated as allowed on Keyser Ridge Loop in Arapaho and Roosevelt National Forests, typically Jun–Nov, per USFS data.
- Are e-bikes allowed on Keyser Ridge Loop?
- Class 1, Class 2, Class 3 e-bikes are designated on Keyser Ridge Loop in the USFS data.
- How long is Keyser Ridge Loop?
- Keyser Ridge Loop measures about 1.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Keyser Ridge Loop?
- USFS data records the tread surface of Keyser Ridge Loop as native material.
- How difficult is Keyser Ridge Loop?
- 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 Arapaho and Roosevelt National Forests (USFS trail geometry isn't mapped).
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