One of the most visually stunning and geologically unique peaks in Colorado, this mountain sits just off the legendary Million Dollar Highway (U.S. 550) between Ouray and Silverton. Famous for its deep red-orange slopes caused by oxidized iron minerals, Red Mountain No. 3 offers incredible summit views, mining history, and solitude—but this hike is a serious challenge.
📍 Overview
Location: Red Mountain Pass, San Juan Mountains (between Ouray & Silverton, CO)
Elevation (Summit): ~12,890 feet
Distance: ~4–6 miles round trip (varies by route)
Elevation Gain: ~2,000+ feet
Difficulty: 🔴 Hard / Advanced
Trail Type: Out-and-back / off-trail scramble
Dog Friendly: ✅ Yes — but only for experienced mountain dogs
Best Time to Hike: Late June – Early October (when snow is gone)
🥾 The Hike: What to Expect
Red Mountain No. 3 does not have a maintained trail, so this is an off-trail route that typically follows old mining roads, social trails, and ridgelines. You’ll be scrambling over loose scree, ascending steep alpine slopes, and navigating without signage.
Trail Highlights:
Fiery red and orange slopes unique to this peak group
Historic mining ruins along the lower slopes (do not enter!)
360° summit views of the Sneffels Range, Red Mountains 1 & 2, and vast alpine basins
Minimal crowds compared to nearby alpine hikes
Navigation Tip: Use a GPS app like Gaia GPS, AllTrails+, or Caltopo, and download offline maps in advance. Cell service is nonexistent on most of this route.
🐾 Is It Pet Friendly?
Yes—leashed dogs are allowed in this area, and there are no wilderness restrictions for pets. However:
⚠️ Important Pet Considerations
The trail is very steep, loose, and off-trail, so it’s only suitable for athletic, experienced dogs.
The red iron-rich soil can stain fur and paws—bring wipes or towels.
No water sources, so carry extra for your dog.
Protect paws from sharp scree and old mining debris—booties recommended.
Watch for wildlife like marmots or mountain goats that could trigger your dog’s prey drive.
Weather Conditions
Weather in the San Juans is highly unpredictable, and Red Mountain Pass is notorious for sudden storms. Even on “partly cloudy” days, lightning can strike by mid-morning.Weather Risks:
Above treeline for most of the hike—lightning danger is real.
Afternoon thunderstorms with hail, wind, and cold are common even in July.
Snow can linger through late June and return as early as late September.
✅ What to Bring:
Waterproof jacket & warm layers
Hat and gloves (yes, even in summer)
Extra socks
Emergency shelter or bivvy
Trekking poles for stability on scree
Canned oxygen or electrolyte tablets to ease altitude symptoms
2–3 liters of water per person
🚗 Getting There
From Ouray or Silverton, drive along U.S. 550 to Red Mountain Pass (~11,000 ft elevation). You’ll access Red Mountain No. 3 via old mining roads and pull-offs along County Road 31 or other jeep trails.
High-clearance 4WD vehicle recommended
Some hikers park near the Yankee Girl Mine or lower down and walk in
The road is steep and exposed—drive with caution. Snow can remain into early summer.
🏕️ Camping & Lodging
Dispersed Camping:
Allowed in many pull-offs along Forest Service roads near Red Mountain Pass
No amenities—pack in and pack out everything
Be bear-aware and store food properly
🏕️ Developed Campgrounds Nearby:
South Mineral Campground (closer to Silverton)
Amphitheater Campground (just above Ouray)
🏡 Lodging:
Ouray: Historic hotels, hot springs, more developed town
Silverton: Rustic mountain vibe, closer to trailhead
⚠️ Final Tips
Start early (sunrise) to avoid storms
Be acclimated—you’re hiking above 12,000 ft
Tell someone your plan—this area is remote and off-trail
