Kellys Grade to Borrego Valley — Pinyon Mountains Desert Divide
Shelf roads, shale, and no guardrails.
The Alpine to Desert Divide Trail in Colorado’s San Juan region is one of those routes that earns its reputation the hard way. Starting near the town of Silverton, the trail climbs through subalpine meadows before dropping into the raw canyon country near Ouray. The route crosses several high passes — including a notorious ledge section above 12,000 feet where the shelf road narrows to single-lane with no guardrails and a straight drop into the canyon below. Loose shale, water bars, and seasonal snow make this a trail that demands full attention.
This is Expert territory. You need a short-wheelbase, lockers front and rear, and skid plates you trust. Lifted long-wheelbase rigs have a rough time on the tighter switchbacks. Best season is late July through September — snowpack lingers into early summer and fall storms can close the upper section overnight without warning. Fuel up in Silverton; there’s nothing out here. Cell service is nonexistent. The payoff is real: you earn views that most people only see from helicopter photos, and dispersed camping on the BLM sections means you can sleep right in the middle of it.
Trail Specs
| Difficulty | Expert |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Dirt, Mixed, Rock |
| Features | Camping, High Altitude, Remote, Scenic |
| Length (miles) | 28 mi / 45.1 km |
| Duration | 1-2 days |
| Max elevation (ft) | 12400 ft |
| Best season | July-September |
| Minimum vehicle | Short-wheelbase 4WD with lockers |
| Nearest town | Silverton, CO |
| Land manager | BLM Uncompahgre Field Office / San Juan National Forest |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | blm.gov |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a long-wheelbase truck or full-size rig run this trail?
No. Short-wheelbase 4WD with lockers is the minimum for a reason — tight switchbacks on shale shelf roads will hang a long-wheelbase vehicle. Full-size trucks and most stock SUVs should skip this one.
When does this trail actually open after winter, and is July always safe?
July through September is the reliable window, but early July can still have snow at elevation — max elevation hits 12,400 ft. Check current conditions with the BLM Uncompahgre Field Office before you roll out; a late snowpack can push the real open date into mid-July.
Do I need a permit to run this trail or camp along it?
No permit required for the trail itself. Dispersed camping is allowed under BLM and San Juan National Forest rules — 14-night stay limit, 200 ft from water sources and trails. No fees as of current BLM guidance, but verify with the Uncompahgre Field Office for any updates.
What's the hardest section and what actually makes it dangerous?
The shale shelf road sections are where rigs get into trouble — loose, platy shale over steep exposure with zero guardrails and no room for error. Tires slide unpredictably on wet shale, so if afternoon storms roll in (common in July-August), the risk level jumps hard and fast.
Is there any water on trail, and how far is the nearest gas from the trailhead?
There are water crossings on route but treat everything — at this elevation, even clear mountain water carries risk. Silverton is your last reliable fuel stop; tank up there, because this is a 28-mile remote run with no services and zero cell service the entire way.
Trail track
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