Continental Divide Trail: Routes, Sections, and Planning

The Continental Divide Trail stretches 3,100 miles from the Mexican border at Crazy Cook Monument, New Mexico, to the Canadian border at Waterton Lakes National Park in Montana — making it the longest and arguably most demanding of America's three major long-distance footpaths. This page covers the trail's official route structure, its five-state geography, the planning realities that separate a successful thru-hike from an abandoned one, and the decision points that define how hikers approach this particular wilderness at any distance. Understanding those variables matters whether the goal is a single-day alpine scramble in Colorado or a six-month end-to-end traverse.

Definition and scope

The CDT is one of three trails that make up the National Scenic Trails system, alongside the Appalachian Trail and the Pacific Crest Trail. Congress designated it under the National Trails System Act in 1978, but the route wasn't declared substantially complete until 2009 — and "substantially complete" is doing a lot of work in that sentence. The Continental Divide Trail Coalition, the trail's primary advocacy organization, manages ongoing route development in coordination with the U.S. Forest Service, National Park Service, and Bureau of Land Management.

The trail crosses five states in sequence: New Mexico (approximately 800 miles), Colorado (approximately 740 miles), Wyoming (approximately 490 miles), Idaho (approximately 200 miles), and Montana (approximately 790 miles). Those mileages are estimates — the CDT has no single fixed route. Unlike the Appalachian Trail, which follows a single blazed corridor, the CDT includes alternates, roadwalks, and officially sanctioned route variations that can add or subtract dozens of miles depending on which path a hiker selects.

Total elevation gain for a northbound thru-hike is roughly 420,000 feet — a figure the Continental Divide Trail Coalition has published as a planning benchmark.

How it works

The trail's management is deliberately distributed. The U.S. Forest Service administers the largest share of CDT mileage, with the BLM and NPS managing significant additional segments through national parks including Yellowstone, Glacier, Rocky Mountain, and Chaco Culture adjacent lands. Permits, regulations, and land management rules shift accordingly at each jurisdictional boundary.

Hikers should expect the following structural elements on any CDT trip:

1. Route selection — The CDT Data Book, published by the Continental Divide Trail Coalition, describes the "official" route, but the trail's unofficial culture openly celebrates alternate routes. The Wind River High Route in Wyoming, for example, is a challenging off-trail alternate that many thru-hikers prefer to the standard path.
2. Navigation demands — The CDT requires active navigation skills throughout. Signage is inconsistent, particularly in New Mexico and Idaho, and GPS with downloaded maps is considered essential rather than optional. Paper maps from Guthooks (now FarOut) or Halfmile remain standard references among experienced CDT hikers.
3. Water sourcing — Desert stretches in New Mexico and southern Colorado routinely feature carries exceeding 20 miles between reliable water sources, making water sourcing and purification planning a genuine logistical constraint, not a precaution.
4. Weather windows — Colorado's high passes, which include stretches above 13,000 feet, see afternoon lightning from June through September. Montana's northern sections frequently receive snow in September, compressing the viable thru-hiking window to roughly May through September for southbounders and April through October for northbounders who start in New Mexico.

Common scenarios

Most CDT travel falls into one of three patterns. Thru-hikers — those completing the full route in a single continuous push — number approximately 500 to 700 starters annually, according to figures the Continental Divide Trail Coalition has tracked, with completion rates hovering around 25 percent. That low completion rate reflects the trail's complexity, not its population.

Section hikers, who complete the trail in multi-year installments, represent a larger and more geographically distributed user group. Popular standalone sections include the San Juan Mountains in southern Colorado (often accessed from Durango or Silverton), the Wind River Range in Wyoming, and Glacier National Park in Montana. These segments can be experienced as backpacking trips of five to fourteen days without committing to the full route.

Day hikers access CDT trailheads throughout the Rocky Mountain corridor, particularly in Rocky Mountain National Park and near resort towns like Breckenridge and Jackson. The trail at these entry points functions as a high-elevation hiking environment that requires the same acclimatization and gear considerations as any alpine terrain.

Decision boundaries

Choosing between a northbound (NOBO) and southbound (SOBO) direction involves tradeoffs that go beyond preference. Northbound hikers starting from Crazy Cook Monument in late April or early May reach Colorado's high passes in June and July, before peak lightning season, and arrive in Montana while late-season weather is still manageable. Southbound hikers who begin in Waterton Lakes in late June or early July face the challenge of descending into New Mexico's desert in late summer heat.

Route choices within each state carry similar weight. The Glacier View Alternate in Montana avoids wilderness permit pressure in certain corridors. New Mexico's Gila River Alternate — a 170-mile detour through the Gila National Forest — adds mileage but delivers riparian scenery and hot springs that the high route bypasses entirely.

Permit requirements vary by segment. Glacier National Park requires backcountry permits for overnight travel, available through the National Park Service reservation system. Rocky Mountain National Park has similar requirements. New Mexico and Wyoming public land segments generally operate on a self-registration or no-permit basis, though this varies by specific land designation.

Gear selection follows terrain logic: the CDT's range from Chihuahuan Desert to alpine tundra to dense Montana forest requires more adaptable clothing and layering systems than either the AT or PCT demand. The hikingauthority.com resource library covers gear selection across all three major long trails.