Potato Hills FSR to Mount McLean Summit — Lillooet Highlands
Shale switchbacks to the roof of Lillooet.
Mount McLean looms above Lillooet at nearly 8,000 feet, and the FSR network clawing up its flanks is the kind of route that separates capable rigs from wishful thinking. You leave pavement on the edge of town and immediately start climbing through dry ponderosa pine and bunchgrass terrain on loose shale and embedded rock. The upper switchbacks tighten hard — some barely wide enough for a full-size truck — and a section of exposed shelf road near the sub-alpine zone will test your nerve if you’ve got any drop-off anxiety. Views of the Fraser Canyon, the town of Lillooet, and the Camelsfoot Range to the northwest open up fast and don’t let go.
This is a Difficult route minimum — experienced drivers with a lifted, lockers-equipped 4×4 will feel at home, but stock rigs will scrape and struggle on the rocky upper pitches. Bring full-size spare and recovery gear. The FSR is typically snow-free from late June through October; after rain, the shale turns greasy and the road becomes a different animal entirely. No permit required. Fuel in Lillooet before you go — there’s nothing out here. Cell service drops to zero within a few kilometres of the pavement.
Trail Specs
| Difficulty | Difficult |
|---|---|
| Trail Type | High Clearance, Technical 4x4 |
| Surface | Dirt, Gravel, Rock |
| Features | Camping, High Altitude, Remote, Scenic |
| Length (miles) | 18 mi / 29 km |
| Duration | 1-2 days |
| Max elevation (ft) | 7900 ft |
| Best season | Late June–October |
| Minimum vehicle | Lifted 4WD with lockers |
| Nearest town | Lillooet, BC |
| Land manager | BC Ministry of Forests — Lillooet District |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock Tacoma or 4Runner run this trail?
No. Stock rigs will get in trouble on the upper shale switchbacks — you need a lifted 4WD with lockers, real skid plates, and decent all-terrain tires. A stock truck with open diffs is asking to get stuck or damaged above treeline.
When does the road open and when does it get sketchy again?
Late June is the realistic opener — snow lingers on the upper ridge well into June most years. By late October, early snowfall and wet shale make the switchbacks genuinely dangerous. July through September is the sweet spot.
Do I need a permit or is there a fee to run this trail?
No permit required and no fee as of current information — it's BC Ministry of Forests land managed out of the Lillooet District. That said, resource roads in BC can be subject to industrial traffic and temporary closures, so check with the Lillooet District office or BC Forest Service road reports before you go.
What's the hardest section and what makes it actually hard?
The upper shale switchbacks below the summit ridge are the crux — loose fractured rock, steep off-camber angles, and tight turns with no guardrails and serious exposure on one side. If your rig breaks traction here, you're not just high-centered, you're in recovery territory with very few options.
Is there water on the trail and how far is the nearest gas from the trailhead?
There are water crossings on the lower section, but don't count on reliable water sources above treeline near the summit — carry what you need for camp. Lillooet is your last fuel stop, roughly 20–30 minutes from the trailhead, so fill up before you leave town.
Trail track
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