USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
Crosier Mountain (USFS trail 931) is a 8 mi trail in Arapaho and Roosevelt National Forests, Colorado. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Crosier 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 | — |
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
Crosier Mountain (USFS trail 931) runs 8 mi through Arapaho and Roosevelt National Forests in Colorado. The figures here are pulled from the official US Forest Service trail data for Arapaho and Roosevelt National Forests, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as 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. 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 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. 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 Crosier Mountain?
- Yes. Mountain bikes are designated as allowed on Crosier Mountain in Arapaho and Roosevelt National Forests, year-round, per USFS data.
- Are e-bikes allowed on Crosier Mountain?
- No e-bike class (1, 2 or 3) is designated on Crosier Mountain in the USFS data.
- How long is Crosier Mountain?
- Crosier Mountain measures about 8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Crosier Mountain?
- USFS data records the tread surface of Crosier Mountain as native material.
- How difficult is Crosier Mountain?
- 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 Arapaho and Roosevelt National Forests (USFS trail geometry isn't mapped).
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