Colorado BDR South Segment — Antonito to Chama via Cumbres Pass and Toltec Gorge Rim
Steam trains, mud, and 10,000-foot empty.
The southern run of the Colorado Backcountry Discovery Route drops out of the San Juan Mountains and makes for the New Mexico line through some of the most consistently high and exposed terrain on the entire BDR network. Starting from Antonito in the San Luis Valley, the route climbs toward Cumbres Pass (10,022 ft), shadowing the Cumbres & Toltec Scenic Railroad grade — a narrow-gauge steam operation that has run this corridor since 1880. The track hugs the rim above Toltec Gorge before dropping through rolling aspen and spruce country toward Chama. Mud is the consistent adversary here: the clay soils above 9,000 feet hold water long after storms and the track can close entirely to wheeled traffic during spring thaw or unseasonal August rain.
Rated Moderate to Difficult depending on conditions. A high-clearance 4WD is minimum — factory lift and all-terrain tires will get you through in good conditions, but lockers make the muddy sections significantly less dramatic. The route crosses Rio Grande National Forest and Carson National Forest; no specific permit is required but the BDR Association’s route data (free GPS tracks via ridgebdr.com) is essential navigation. Best window is July through September after the snowmelt drains and before October closures. Fuel in Antonito before you leave — Chama has it on the New Mexico end. Dispersed camping is legal throughout the national forest sections and the payoff is campsite views at 10,000 feet with zero neighbours.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Backcountry, High Clearance, Overland Route |
| Surface | Dirt, Gravel, Mixed |
| Features | Camping, High Altitude, Historic, Remote, Scenic |
| Length (miles) | 68 mi / 109.4 km |
| Duration | 1-2 days |
| Max elevation (ft) | 10022 ft |
| Best season | July-September |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Antonito, Colorado |
| Land manager | USDA Forest Service — Rio Grande and Carson National Forests |
| Permit required | No |
| Cell service | None |
| Water crossings | No |
| Dispersed camping | Yes |
| Official sources | USFS Rio Grande National Forest BDR Colorado Route Info |
| Start coordinates | |
| End coordinates | |
| Copy both for Google Maps directionsClick to copy the directions URL · or open it directly in a new tab | |
| Find on Google | Search on Google → |
Location
Trail Conditions
No recent condition reports. Be the first to post one.
Log in to post a condition report.
Frequently asked questions
Can a stock Tacoma or 4Runner handle this segment without modifications?
Yes — a stock high-clearance 4WD with decent all-terrain tires is enough for this segment under dry conditions. Mud near Cumbres Pass can get sloppy after rain, so locker or limited-slip helps but isn't mandatory. Lifted rigs will have an easier time in the wet stuff.
When does Cumbres Pass typically open and close for the season?
The route is generally accessible July through September. Snow can linger into late June at 10,000 feet and return by October — sometimes earlier. Don't count on it being passable before the Fourth of July without checking current conditions with USFS Rio Grande.
Do you need any permits or passes to run this segment?
No permit is required to drive this BDR segment through Rio Grande and Carson National Forests. Dispersed camping is free and follows standard USFS rules — 14-day limit, 300 feet from water and roads. No fee stations on this stretch.
What's the hardest part of this segment and what makes it sketchy?
The Toltec Gorge rim section is the one to respect — narrow shelf road with significant exposure and no guardrails. It's not technically difficult in dry conditions, but a mistake has real consequences. Wet clay on the approach to Cumbres is where most rigs get stuck.
How much fuel range do I need, and where's the last reliable gas before heading out?
The full 68-mile segment has zero fuel options between Antonito and Chama — fill up in Antonito before you leave and plan for Chama on the other end. With side exploring, budget 80–90 miles of range minimum; 100+ is comfortable. Cell service is nonexistent on the route, so don't count on locating a station mid-run.
Trail track
No GPX track for this trail yet. If you've driven it and have a track, contribute below.
Log in to contribute a GPX track.