Colorado's backcountry offers some of the most dramatic alpine scenery in the lower 48. With over 50 peaks above 14,000 feet, extensive wilderness areas, and well-maintained trail networks, the state is a backpacker's paradise. Here are the best 3-day trips to add to your list.
Four Pass Loop — Maroon Bells Wilderness
The Four Pass Loop is widely considered one of the finest backpacking routes in Colorado. This 26-mile circuit crosses four mountain passes above 12,000 feet, each offering jaw-dropping views of the Elk Mountains.
Key Details:
- Distance: 26.5 miles
- Elevation Gain: ~7,800 ft
- Best Season: Mid-July through September
- Permit Required: Yes — free self-registration at trailhead
The route starts from the Maroon Bells Scenic Area near Aspen and climbs through wildflower meadows, past turquoise alpine lakes, and over rocky passes. Most hikers go clockwise, camping at Snowmass Lake on night one and near Frigid Air Pass on night two.
Water Sources: Reliable streams and snowmelt are available throughout the route in summer. Snowmass Lake is a highlight and a perfect water fill-up point.
Pro Tips:
- Start early each day — afternoon thunderstorms are common above treeline
- Bring trekking poles for the steep, rocky descents off each pass
- Bear canisters are required in the Maroon Bells Wilderness
Chicago Basin — Weminuche Wilderness
Chicago Basin gives you access to three fourteeners (Windom, Sunlight, and Eolus) from a stunning alpine basecamp. Access is via the Durango & Silverton Narrow Gauge Railroad, making it one of the most unique wilderness approaches in the state.
Key Details:
- Distance: ~16 miles round trip (plus peak scrambles)
- Elevation Gain: ~5,000 ft to basin
- Best Season: July through September
- Permit: No permit required
You'll ride the historic train to Needleton station and hike 6 miles up to the basin. Set up basecamp and spend your second day bagging peaks before hiking out on day three.
Water: Needle Creek provides reliable water throughout the approach. In the basin, snowmelt streams are available through August.
Lost Creek Wilderness Loop
For something less alpine but equally beautiful, the Lost Creek Wilderness offers a quieter 3-day loop through granite formations, aspen groves, and rolling meadows. This area sees far fewer visitors than the popular 14er routes.
Key Details:
- Distance: ~25 miles (Goose Creek loop)
- Elevation Gain: ~4,000 ft
- Best Season: June through October
- Permit: No permit required
The terrain is gentler than the high alpine routes, making it accessible for intermediate backpackers. The unique rock formations — massive granite domes and spires — give this area a character unlike anywhere else in Colorado.
Planning Your Colorado Trip
Altitude Acclimation: If you're coming from sea level, spend at least a day in Denver or a mountain town before hitting the trail. Most Colorado backpacking routes are above 10,000 feet, and altitude sickness can ruin a trip.
Lightning Safety: Colorado's mountains are famous for afternoon thunderstorms, especially in July and August. Plan to be below treeline by early afternoon and know the signs of approaching storms.
Leave No Trace: Colorado's alpine environments are fragile. Camp on durable surfaces, pack out all waste, and stay on established trails to protect the tundra.
Ready to plan your Colorado trip? Use our trip planner to get personalized recommendations based on your experience level and preferences.