Colorado BDR Southern Segment — Antonito to Chama via Cumbres Pass and the Toltec Gorge Rim

The southern segment of the Colorado Backcountry Discovery Route drops out of the high San Juans across the Colorado–New Mexico state line via Cumbres Pass, one of the highest railroad crossings in North America. You’re sharing this country with the Cumbres & Toltec Scenic Railroad, a heritage narrow-gauge line that still runs through the gorge below you. The route threads forest roads through Carson National Forest, crossing the Chama River drainage and passing through high meadows and old-growth spruce above 10,000 ft before descending into the small border town of Chama, New Mexico. The road surfaces range from packed gravel to loose shale to occasional mud — nothing technically brutal, but the sustained elevation and exposure demand a competent setup.

A stock 4WD with high clearance handles this segment cleanly in good conditions, though afternoon thunderstorms from July onward can make the shale sections slick fast. Fuel in Chama and Antonito before you go — there’s nothing in between. No permits required on the national forest sections. Best window is late June through September before early snow closes Cumbres Pass. Cell service is essentially zero once you leave pavement. This is a connector segment that rewards you with big open country and a legit high-altitude crossing rather than a destination in itself — and that’s exactly the point of riding a BDR.