USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
South Saint Vrain (USFS trail 909) is a 5.8 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 South Saint Vrain?
| 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.
Watch Arapaho and Roosevelt National Forests for access changes
Email me when USFS mountain-bike or e-bike designations change for trails in Arapaho and Roosevelt National Forests. Free, unsubscribe anytime.
About this trail
In Arapaho and Roosevelt National Forests, Colorado, South Saint Vrain (USFS trail 909) covers 5.8 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. 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 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. Treat this as a planning reference rather than a live conditions report, and verify any time-sensitive closure or order with the ranger district that manages Arapaho and Roosevelt National Forests.
Frequently asked questions
- Can you mountain bike on South Saint Vrain?
- Yes. Mountain bikes are designated as allowed on South Saint Vrain in Arapaho and Roosevelt National Forests, year-round, per USFS data.
- Are e-bikes allowed on South Saint Vrain?
- No e-bike class (1, 2 or 3) is designated on South Saint Vrain in the USFS data.
- How long is South Saint Vrain?
- South Saint Vrain measures about 5.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of South Saint Vrain?
- USFS data records the tread surface of South Saint Vrain as native material.
- How difficult is South Saint Vrain?
- 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).
Where to stay near Arapaho and Roosevelt National Forests
Find hotels, cabins, and vacation rentals near Arapaho and Roosevelt National Forests — plan your ride.
Top-rated places to stay near Arapaho and Roosevelt National Forests
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Riding Arapaho and Roosevelt National Forests?
Trail-access updates and trip ideas by email.