Sawmill Road to Blanco Peak — San Luis Valley to Conejos Canyon via Conejos River Road
Southern Colorado's forgotten canyon run to the high country.
The Conejos River drains one of the least-traveled corners of the Rio Grande National Forest, cutting a deep canyon through volcanic rock south of the Weminuche Wilderness boundary before flattening into the San Luis Valley floor near Antonito. Forest Road 250 follows the river upstream from its lower canyon walls all the way to Elk Creek and the trailhead systems approaching Blanco Peak — at 14,345 feet, the highest summit in the San Juan Mountains. The road itself is largely gravel but deteriorates significantly above the Platoro Reservoir area, where washed-out sections, deep ruts, and stream crossings across Conejos tributaries demand full-time 4WD attention. The upper drainage above Platoro is genuinely remote — plan for it.
Moderate to difficult depending on how high you push. A stock 4WD with decent clearance handles the lower canyon; above Platoro you want a locker or at minimum aggressive all-terrain tires. Best season is late June through September — the high road washes out annually and Rio Grande NF posts closure updates. Platoro has a small store and fuel seasonally — don’t count on it as your only resupply. No permits required for vehicle travel. Dispersed camping is permitted throughout the national forest corridor. Cell service disappears below the rim and doesn’t come back until the valley floor.
Trail Specs
| Difficulty | Difficult |
|---|---|
| Trail Type | Backcountry, High Clearance, Overland Route |
| Surface | Dirt, Gravel, Mixed |
| Features | Camping, High Altitude, Remote, Scenic, Water Crossings |
| Length (miles) | 47 mi / 75.6 km |
| Duration | 1-2 days |
| Max elevation (ft) | 11400 ft |
| Best season | Late June-September |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Antonito, CO |
| Land manager | USFS Rio Grande National Forest — Conejos Peak Ranger District |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | USFS Conejos Peak Ranger District |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a stock Tacoma or 4Runner handle this route, or do I need a lifted rig?
A stock high-clearance 4WD like a Tacoma or 4Runner can make it, but you'll want at minimum all-terrain tires and working lockers help on the upper sections near Blanco Peak. Lifted rigs with skid plates will have more margin on the rocky climbs and water crossings. A Jeep Gladiator on stock rubber is about the floor of what's reasonable here.
When does the trail actually open in spring, and is there a hard close date in fall?
Late June is the realistic open window — the upper elevations hold snow well into June and the Conejos River crossings run dangerously high during snowmelt. September is your cutoff; early October storms can drop snow at 11,000 ft fast and mud can trap vehicles on the descent. Check current conditions with the Conejos Peak Ranger District before heading out.
Do I need a permit to run this route or camp along the Conejos River corridor?
No permit is required to drive the route or dispersed camp within Rio Grande National Forest boundaries. Standard USFS dispersed camping rules apply — 300 feet from water sources, no stays longer than 14 days. If you're continuing to Blanco Peak trailhead and entering the Weminuche Wilderness on foot, no permit is currently required for that either.
What's the hardest section and what specifically makes it hard?
The upper climb out of the Conejos Canyon toward the Blanco Peak trailhead is where rigs get sorted — loose shale, off-camber shelf road, and exposed switchbacks with 4,100 ft of gain crammed into the back half of the route. The water crossings on the Conejos River earlier in the route aren't deep but they're rocky-bottomed and can catch low-clearance skid plates. Wet conditions make both sections significantly worse.
Is there any gas or resupply between Antonito and the trailhead, and how far is the nearest fuel?
No — Antonito is your last gas stop, period. The route is 47 miles of backcountry with zero services, and there's no cell service anywhere on trail to call for help. Top off in Antonito before you leave and run the math on your range; a full tank and a jerry can is the right call for any rig getting under 20 mpg.
Trail track
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