Centennial Mountains Red Rock Pass Route
Continental Divide crossing through big sky country
Red Rock Pass sits at 7,056 feet on the Continental Divide, marking the historic divide between Pacific and Atlantic watersheds while connecting Montana’s remote Centennial Valley to Idaho’s Island Park. This route follows old wagon roads and cattle drives through the Centennial Mountains, passing weathered homestead ruins and offering panoramic views of the Yellowstone ecosystem. The technical challenge comes at Red Rock Creek crossing and the rocky descent into Lima Reservoir, where loose shale and narrow shelf roads demand attention.
Moderate difficulty requires stock 4WD with good ground clearance for rocky sections and creek crossings. Summer through early fall provides the best access, though snow can linger at elevation into June. No permits needed, but bring extra fuel and water as services are 40+ miles away in either direction. The payoff is solitude in genuine big sky country, dispersed camping among aspen groves, and wildlife including moose, elk, and occasional wolves in one of the West’s most remote valleys.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Overland Route |
| Surface | Mixed |
| Features | Camping, High Altitude, Historic, Remote, Scenic, Water Crossings |
| Length (miles) | 28 mi / 45.1 km |
| Duration | 1-2 days |
| Max elevation (ft) | 7056 ft |
| Best season | June-October |
| Minimum vehicle | Stock 4WD high-clearance |
| Nearest town | Lima, Montana |
| Land manager | Beaverhead-Deerlodge National Forest |
| 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 4Runner or Tacoma handle this route without modifications?
Yes — the trail's moderate rating is manageable for a stock 4WD with decent clearance. You'll want high-clearance 4WD engaged on the rougher sections near the pass, but nothing here requires a lift or lockers under normal summer conditions.
When does the road to Red Rock Pass typically open after winter?
Late May to mid-June depending on snowpack — 2024 was still showing snow near the pass into early June. Stick to June through October for reliable access; early season can leave you in axle-deep mud even when the road looks drivable.
Do I need a permit to drive this route or camp along it?
No permit required to drive the route. Dispersed camping is allowed under Beaverhead-Deerlodge National Forest rules — 14-day stay limit, 200 feet from water sources, pack out everything. No fee stations on this stretch.
What's the hardest section and what should I actually expect?
The climb to Red Rock Pass itself is the crux — loose rock, some shelf road exposure, and rutting that gets worse after rain or early-season runoff. Nothing technical enough to stop a capable stock rig, but it'll rattle your fillings and test your air-down discipline.
How far is it to the nearest gas, and is there any cell service on the route?
Lima, Montana is your last reliable fuel stop before heading in — plan for a round trip with no resupply, as there's nothing in Centennial Valley or Island Park side that's guaranteed open. Cell service is zero for the entire 28 miles, so download your maps offline before you leave pavement.
Trail track
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