USFS National Forest System Trails · Flathead National Forest · Montana · Updated June 2026
Lupine Lake (USFS trail 210) is a 4 mi trail in Flathead National Forest, Montana. Mountain bikes are designated as allowed, Jun–Nov, with Class 1 e-bikes also designated.
Can I bike Lupine Lake?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Jun–Nov |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jan–Aug, December |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jan–Aug, December |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jan–Aug, December |
Zooming out: across Flathead National Forest, 27% of rideable trail miles are open to mountain bikes — a Bike Access Grade of C.
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About this trail
Lupine Lake (USFS trail 210) is a 4 mi trail in Flathead National Forest, 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. USFS records list its surface 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, with a Jun–Nov season in the data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Jan–Aug, 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 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 Flathead National Forest.
Frequently asked questions
- Can you mountain bike on Lupine Lake?
- Yes. Mountain bikes are designated as allowed on Lupine Lake in Flathead National Forest, typically Jun–Nov, per USFS data.
- Are e-bikes allowed on Lupine Lake?
- Class 1, Class 2, Class 3 e-bikes are designated on Lupine Lake in the USFS data.
- How long is Lupine Lake?
- Lupine Lake measures about 4 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Lupine Lake?
- USFS data records the tread surface of Lupine Lake as native material.
- How difficult is Lupine Lake?
- 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 Flathead National Forest (USFS trail geometry isn't mapped).
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