USFS National Forest System Trails · Tongass National Forest · Alaska · Updated June 2026
Thimbleberry/Heart Lake Trail (USFS trail 31192) is a 0.8 mi trail in Tongass National Forest, Alaska. Mountain bikes are designated as allowed, May–Sep, with no Class 1 e-bike designation on record.
Can I bike Thimbleberry/Heart Lake Trail?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | May–Sep |
| 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 Tongass National Forest, 0% of rideable trail miles are open to mountain bikes — a Bike Access Grade of F.
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About this trail
In Tongass National Forest, Alaska, Thimbleberry/Heart Lake Trail (USFS trail 31192) covers 0.8 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. The tread is mapped as imported loose 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. Bike use is designated as allowed, typically May–Sep. 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 Tongass National Forest.
Frequently asked questions
- Can you mountain bike on Thimbleberry/Heart Lake Trail?
- Yes. Mountain bikes are designated as allowed on Thimbleberry/Heart Lake Trail in Tongass National Forest, typically May–Sep, per USFS data.
- Are e-bikes allowed on Thimbleberry/Heart Lake Trail?
- No e-bike class (1, 2 or 3) is designated on Thimbleberry/Heart Lake Trail in the USFS data.
- How long is Thimbleberry/Heart Lake Trail?
- Thimbleberry/Heart Lake Trail measures about 0.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Thimbleberry/Heart Lake Trail?
- USFS data records the tread surface of Thimbleberry/Heart Lake Trail as imported loose material.
- How difficult is Thimbleberry/Heart Lake Trail?
- 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 Tongass National Forest (USFS trail geometry isn't mapped).
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