USFS National Forest System Trails · Custer Gallatin National Forest · Montana · Updated June 2026
Halbert Gulch Crossover (USFS trail 3817A) is a 1.5 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 Halbert Gulch Crossover?
| 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
Halbert Gulch Crossover (USFS trail 3817A) runs 1.5 mi through Custer Gallatin National Forest in Montana. 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. USFS slope data puts it in the Easy band (grade band +0-5%), meaning a gentle climb — keep in mind this measures steepness, not trail technicality. Mountain bikes are allowed, with a Jan–Oct, December season in the data. The record additionally permits Class 1, Class 2, Class 3 e-bike use, Jan–Oct, December; recall that Class 1 is pedal-assist, while Class 2 adds a throttle and Class 3 a higher cutoff 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 Halbert Gulch Crossover?
- Yes. Mountain bikes are designated as allowed on Halbert Gulch Crossover in Custer Gallatin National Forest, typically Jan–Oct, December, per USFS data.
- Are e-bikes allowed on Halbert Gulch Crossover?
- Class 1, Class 2, Class 3 e-bikes are designated on Halbert Gulch Crossover in the USFS data.
- How long is Halbert Gulch Crossover?
- Halbert Gulch Crossover measures about 1.5 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Halbert Gulch Crossover?
- USFS data records the tread surface of Halbert Gulch Crossover as native material.
- How difficult is Halbert Gulch Crossover?
- 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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