The Colorado Trail is a 485-mile high-alpine route along the spine of the Colorado Rockies from Denver to Durango. Divided into 28 segments plus the Collegiate West alternate, the trail crosses six national forests and eight wilderness areas, climbing from 5,500 feet at Waterton Canyon to 13,334 feet at Coney Summit. Most of the trail stays above 10,000 feet, averaging 10,300 feet in elevation with approximately 89,000 feet of total gain.
This is a trail for backpackers who want a serious mountain challenge. The terrain is unrelenting: steep climbs at oxygen-depleted altitudes, exposed ridgelines where afternoon thunderstorms build daily, and long waterless stretches that require careful planning. The standard thru-hike takes 4-6 weeks at 10-14 miles per day, though terrain and weather often prevent big-mile days. Most hikers start from Denver (southbound), which allows gentler acclimatization than the brutal opening climb from Durango through the San Juan Mountains.
The Collegiate Peaks section presents a choice: the standard Collegiate East route or the more difficult Collegiate West alternate. The West route runs 83 miles at 11,000-12,000 feet, with whole sections above 12,000 feet. It is higher, harder, and by most accounts more spectacular.
No advance permit or fees are required for the Colorado Trail itself. When crossing into wilderness areas, which happens multiple times along the route, you must complete a free self-service permit at the trailhead station. Self-registration is required in the Collegiate Peaks and San Juan segments. Keep half the permit with you while in the wilderness.
Some National Forest campgrounds and parking areas charge day-use fees. A Colorado State Wildlife Area Pass may be required for the first half-mile of Segment 12 on the Collegiate East route, depending on your route.
Group size limits vary by wilderness area but generally max out at 12-15 people. Camping is prohibited in Waterton Canyon (the first section from Denver) and on private land (shown in white on guidebook maps). Otherwise, dispersed camping is allowed throughout, and Leave No Trace principles apply.
Bear canisters are not legally required on most of the Colorado Trail, but the Colorado Trail Foundation strongly recommends hard-sided food storage for thru-hikers. Maroon Bells-Snowmass Wilderness (if you venture off-trail) requires IGBC-approved canisters year-round. Black bears are present but generally stay below 10,000 feet and are far less aggressive than Sierra bears. The campsite near Jefferson Creek (mile 78, before Georgia Pass) has seen frequent bear activity because past hikers stored food improperly.
July 1 through early September is the core season. The Colorado Trail Foundation recommends July 1 as the earliest start date for most hikers planning long distances. Most of the trail is snow-free by early July and remains so into September, though remnants persist at higher elevations and on north-facing hillsides.
Starting in June means deep snow, often several feet, as early as Georgia Pass (Segment 6) and along the Ten Mile Range (Segment 7). Snow lingers longer in the San Juan Mountains at the southern end, so hikers starting from Durango face snow challenges even later in the season.
Mid-July through mid-August is peak monsoon season, with afternoon thunderstorms nearly every day. Storms typically build around 1 PM and continue until late afternoon. Lightning is a serious threat on exposed ridges, so plan to reach treeline by noon. Hikers treat "treeline by noon" as a survival rule, not a suggestion.
Late August is considered a late start for thru-hiking. September brings fewer thunderstorms and the beginning of fall colors (aspens peak late September), but expect cold nights and possible early season snowstorms. October brings regular snowfall.
Wildflowers peak late June through late July. Kenosha Pass has miles of trail through aspen groves, colorful with summer wildflowers and golden in fall.
Water is generally abundant, but a few dry stretches demand attention. The longest waterless section runs from Straight Creek (Segment 26, mile 8.4) to Taylor Lake (Segment 27, mile 19.4), approximately 22 miles. Other notable dry stretches include Segments 2-3 (14 miles), Segments 18-19 (11 miles), and Segments 26-27 (22 miles).
Water reliability is seasonal. Early season hikers benefit from snowmelt-fed sources, but late season can mean checking several potential sources before finding water. The Colorado Trail Databook marks sources with symbols (full cup, half cup, empty cup) indicating reliability, but conditions change yearly. Top off whenever possible and carry more capacity than you think necessary.
Water quality ranges from clear alpine streams to murky cow-trampled rivers. Bring flavored drink mix for the worst sources; filters remove bacteria but do nothing for smell and taste.
Resupply towns from north to south: Bailey, Jefferson, Frisco, Breckenridge, Copper Mountain (right on trail), Leadville, Twin Lakes Village, Buena Vista, Mount Princeton Hot Springs (right on trail), Salida, Monarch Crest (limited), Creede, Lake City, Silverton, Molas Lake, and Durango. Northern towns like Breckenridge, Frisco, and Salida have full services. Southern options become more limited and expensive. Lake City is popular for mail drops. Distance from trail ranges from visible (Copper Mountain, Princeton Hot Springs) to 40 miles (Gunnison, though rarely used).
Altitude sickness is the primary concern. Most of the trail sits above 10,000 feet, and anyone unacclimatized to elevation is at risk above 5,000 feet. Southbound starts from Denver allow gradual acclimatization; northbound starts from Durango throw you immediately into 12,000+ foot terrain.
Lightning kills. During monsoon season (mid-July to mid-August), thunderstorms develop almost daily. Be off exposed ridges and summits by noon, no exceptions. That means breaking camp at first light to summit passes before storms build.
The high, dry climate causes severe dehydration and UV exposure. You sweat constantly, but it evaporates so fast you don't notice. The thin atmosphere means intense sun even on overcast days. Protect skin and eyes religiously.
River crossings exist but rarely show up in trip reports as major hazards. Snow traverses in the San Juans early in the season can be dangerous: steep, icy slopes without good footing. June hikers may need ice axes and microspikes.
Weather changes rapidly. Expect thunderstorms, lightning, snow, hail, driving rain, blinding sun, intense heat, howling wind, and freezing cold, sometimes all in one day. Essential layers include rain gear (jacket and pants), a puffy jacket, a fleece midlayer, warm pants, and sun protection. Keep your warmest layers dry at all costs.
Navigating snow-buried trail in the San Juans is difficult even with GPS. You often cannot see the trail or even the corridor. In high snow years, expect wet feet, slow paces, sketchy traverses, and long stretches where the actual trail is anyone's guess.
Denver/Waterton Canyon Trailhead (Northern Terminus):
About 50 miles from Denver International Airport, 35-40 miles from downtown Denver. Not accessible by public transit; you need a car or shuttle. Overnight parking is NOT allowed in the trailhead lot administered by Denver Water. Past thru-hikers have used nearby RV storage lots for long-term parking (search online for options).
Durango/Junction Creek Trailhead (Southern Terminus):
About a 45-minute drive from Durango-La Plata Airport, 4.5 miles from downtown Durango. Only accessible by car or shuttle. Long-term parking is available at Durango Transportation Center downtown (970-375-4960, call weekdays 8 AM-5 PM). Some shuttle services offer vehicle storage.
Shuttles:
The Colorado Trail Foundation maintains a trail angel list with dozens of locals offering shuttles, including many who specialize in airport-to-trailhead transport. Commercial options include Buck Horn Limousine (970-769-0933) in Durango, which understands thru-hikers, offers parking, and shuttles to trailheads and airports.
Strategy:
Consider leaving your vehicle at the finish point. Many southbound hikers drive to Durango, park, then shuttle to Denver to start. Having your car waiting at the end removes the logistics question when you finish, whenever that happens.
Nearest major airports: Denver International (north end) and Durango-La Plata (south end). Albuquerque is another option for Durango access.
Start southbound from Denver unless you are exceptionally fit and well-acclimatized. The northbound route from Durango climbs from 7,000 to 12,000+ feet in 23 miles, the most vertical of all 28 segments.
Budget conservatively: 3-4 dollars per mile and five weeks total. Notify family and work as far in advance as possible.
Food storage is contentious. Bear hangs are nearly impossible in Colorado's pine forests, and many hikers skip bear canisters since they are not legally required. An Ursack AllMitey (puncture-proof) paired with an Opsak (odor-proof) covers you without the weight and bulk of a hard-sided canister.
Fire restrictions are common, especially in late summer. Stage 2 restrictions prohibit all fires, including in developed campgrounds. Plan your trip assuming no campfires, and bring a liquid/gas stove with an on/off valve. Many wilderness areas prohibit fires within 100 feet of lakes, streams, or trails year-round.
Pack for four seasons. Weather at altitude is violent and unpredictable. Rain gear, warm layers, and sun protection are non-negotiable.
Don't leave water sources thirsty. The dry stretches are real, and late-season sources can fail. Carry more capacity than you think necessary.
Camp selection strategy: Established sites are common and preferable to minimize impact. Camping is prohibited in Waterton Canyon, and private land boundaries must be respected. The San Juans offer high camping with big views but full exposure to weather, so balance views against shelter.
Monsoon timing: Start hiking at first light to reach high passes and exposed ridges before noon. Afternoon storms are predictable; use that to your advantage.
The Collegiate West alternate is harder, higher, longer, and more beautiful than Collegiate East. Choose based on your fitness, acclimatization, and appetite for challenge. The West route requires solid navigation skills and comfort with exposure.
The Jefferson Creek campsite (mile 78) sees regular bear activity, so be extra vigilant with food storage there.
Wildlife is limited at these elevations. Black bears stay mostly below 10,000 feet. Marmots and pikas are common, and moose and elk are possible. Lightning is more dangerous than any animal.
The Colorado Trail Foundation's official guidebook and databook are essential. Both are organized by the 28 segments with detailed water, camping, and access information, and the databook is especially useful for tracking water sources and elevation profiles.
Colorado's thin air makes you underestimate dehydration. Drink more than you think you need, constantly.
This trail demands respect. It is high, long, exposed, and unforgiving of poor planning, and few trails in the Lower 48 offer a comparable sustained mountain challenge.
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