USFS National Forest System Trails · Eldorado National Forest · California · Updated June 2026
Crosier Run (USFS trail 11E37) is a 11.2 mi trail in Eldorado National Forest, California. Mountain bikes are designated as allowed year-round, with Class 1 e-bikes also designated.
Can I bike Crosier Run?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | year-round |
| Class 2 e-bike (throttle, 20 mph) | Allowed | year-round |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | year-round |
Zooming out: across Eldorado National Forest, 94% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
Watch Eldorado National Forest for access changes
Email me when USFS mountain-bike or e-bike designations change for trails in Eldorado National Forest. Free, unsubscribe anytime.
About this trail
Crosier Run (USFS trail 11E37) runs 11.2 mi through Eldorado National Forest in California. 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. Underfoot, the trail is recorded as native material. Based on slope, this is a Advanced trail (grade band 12-20%); that reflects steep gradient and is not the same as a technical MTB difficulty rating. Mountain bikes are allowed, open year-round in the data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated — 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. 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 Run?
- Yes. Mountain bikes are designated as allowed on Crosier Run in Eldorado National Forest, year-round, per USFS data.
- Are e-bikes allowed on Crosier Run?
- Class 1, Class 2, Class 3 e-bikes are designated on Crosier Run in the USFS data.
- How long is Crosier Run?
- Crosier Run measures about 11.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Crosier Run?
- USFS data records the tread surface of Crosier Run as native material.
- How difficult is Crosier Run?
- 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 Eldorado National Forest (USFS trail geometry isn't mapped).
Where to stay near Eldorado National Forest
Find hotels, cabins, and vacation rentals near Eldorado National Forest — plan your ride.
Top-rated places to stay near Eldorado National Forest
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Riding Eldorado National Forest?
Trail-access updates and trip ideas by email.