USFS National Forest System Trails · Coronado National Forest · Arizona · Updated June 2026
Perimeter (USFS trail 138B) is a 2.2 mi trail in Coronado National Forest, Arizona. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Perimeter?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | — | |
| Class 2 e-bike (throttle, 20 mph) | — | |
| Class 3 e-bike (pedal-assist, 28 mph) | — |
Zooming out: across Coronado National Forest, 84% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In Coronado National Forest, Arizona, Perimeter (USFS trail 138B) covers 2.2 mi of National Forest System trail. This profile summarizes what the official US Forest Service trail record says about riding it: how long the trail is, what it's built on, how steep the route grades out, and which forms of bike use the agency has designated. 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. No e-bike class (1, 2 or 3) is designated on this trail in the USFS data, so treat it as a non-motorized route unless a posted order says otherwise. 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 Coronado National Forest.
Frequently asked questions
- Can you mountain bike on Perimeter?
- Yes. Mountain bikes are designated as allowed on Perimeter in Coronado National Forest, year-round, per USFS data.
- Are e-bikes allowed on Perimeter?
- No e-bike class (1, 2 or 3) is designated on Perimeter in the USFS data.
- How long is Perimeter?
- Perimeter measures about 2.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Perimeter?
- USFS data records the tread surface of Perimeter as native material.
- How difficult is Perimeter?
- 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 Coronado National Forest (USFS trail geometry isn't mapped).
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