Overlanding Colorado's Alpine Loop: What to Know

The Alpine Loop in Colorado's San Juan Mountains is on every overlander's list for good reason. Connecting Ouray, Silverton, and Lake City over passes above 12,000 feet, it threads through old mining country and alpine tundra with scenery that's genuinely breathtaking. It's also high, exposed, and weather-dependent — so a little preparation goes a long way.

The Route

The core of the loop runs over Engineer Pass (12,800 ft) and Cinnamon Pass (12,640 ft). The main route is achievable in a stock high-clearance 4WD with a careful driver, while harder optional trails nearby — Black Bear, Imogene, Poughkeepsie — demand more capable, well-built trucks and real experience.

When To Go

The passes are typically snow-free roughly July through September, but high-country weather is fickle year-round. Afternoon thunderstorms are common; start early, watch the sky, and never get caught above treeline in lightning. Snow can fall in any month up there.

Altitude and Your Truck

At 12,000+ feet, naturally aspirated engines lose noticeable power, and so do people — hydrate and pace yourself. Make sure your cooling system, brakes, and tires are in top shape before you go; shelf roads punish weak brakes and tired suspension.

Do It Guided

The Alpine Loop rewards local knowledge — which spurs are worth it, where the weather turns, how to handle the shelf sections. It's exactly the kind of route our guided Colorado expeditions exist for. Come run it with people who know it, and just enjoy the view.