USFS National Forest System Trails · Custer Gallatin National Forest · Montana · Updated June 2026
Iron Spring (USFS trail 3062) is a 5 mi trail in Custer Gallatin National Forest, Montana. Mountain bikes are designated as allowed, Jan–Oct, December, with Class 1 e-bikes also designated.
Can I bike Iron Spring?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Jan–Oct, December |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jan–Oct, December |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jan–Oct, December |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jan–Oct, December |
Zooming out: across Custer Gallatin National Forest, 98% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
Iron Spring (USFS trail 3062) is a 5 mi trail in Custer Gallatin National Forest, Montana. The figures here are pulled from the official US Forest Service trail data for Custer Gallatin National Forest, 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. Its grade-based difficulty is Easy (grade band +0-5%) — a gentle steepness profile derived from USFS slope data, not a technical mountain-bike rating. Mountain bikes are allowed, with a Jan–Oct, December season in the data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Jan–Oct, December) — 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 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. 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 Custer Gallatin National Forest.
Frequently asked questions
- Can you mountain bike on Iron Spring?
- Yes. Mountain bikes are designated as allowed on Iron Spring in Custer Gallatin National Forest, typically Jan–Oct, December, per USFS data.
- Are e-bikes allowed on Iron Spring?
- Class 1, Class 2, Class 3 e-bikes are designated on Iron Spring in the USFS data.
- How long is Iron Spring?
- Iron Spring measures about 5 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Iron Spring?
- USFS data records the tread surface of Iron Spring as native material.
- How difficult is Iron Spring?
- Its grade-based difficulty is Easy (grade band +0-5%), 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 Custer Gallatin National Forest (USFS trail geometry isn't mapped).
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