Sunlight Peak, Windom Peak, Mount Eolus via Animas River Trail
Sunlight Peak, Windom Peak, Mount Eolus via Animas River Trail
1
hikers
Sunlight Peak, Windom Peak, Mount Eolus via Animas River Trail
16:23
34.9km
2,610m
Hiking
Embark on a challenging high-alpine adventure through the remote Weminuche Wilderness, hiking the Sunlight Peak, Windom Peak, Mount Eolus via Animas River Trail. This difficult route spans 21.7 miles (34.9 km) and demands a significant 8561 feet (2609 metres) of elevation gain, typically requiring 16 hours and 22 minutes to complete. You will experience stunning alpine scenery and diverse terrain as the trail steadily climbs towards Chicago Basin, a renowned base camp. Here, expect to find abundant wildflowers, picturesque waterfalls, and even tame mountain goats before the path becomes steeper and rougher, leading to the spectacular Twin Lakes at 12,500 feet with views of rugged peaks.
This is a multi-day backpacking trip, so plan for several days to allow for proper acclimatization and multiple summit attempts from a base camp in Chicago Basin. Accessing the trailhead can be challenging; you can either hike in from Purgatory Trailhead or opt for a shorter approach by taking the historic Durango & Silverton Narrow Gauge Railroad to Needleton. Ensure you are well-prepared for remote conditions and carry all necessary supplies for an extended stay in the wilderness.
This route is notable for connecting three prominent Colorado Fourteeners: Sunlight Peak, Windom Peak, and Mount Eolus. The journey offers a true high-alpine experience, immersing you in a pristine natural environment far from civilization. The trail's remote location and significant elevation make it a prime destination for experienced hikers seeking solitude and grand mountain vistas.
Last updated: April 23, 2026
Tips
Includes segments that are highly dangerous
Parts of this route comprise highly technical, difficult, or hazardous terrain. Specialist equipment and prior experience is required.
After 27.9 km for 1.03 km
After 31.6 km for 1.77 km
Waypoints
Start point
Get Directions
27 m
Purgatory Trailhead
Highlight • Trail
Tip by
6.48 km
Purgatory Trail & Animas River Trail junction
Highlight • Trail
Tip by
17.7 km
Waterfall
Waterfall
18.5 km
Waterfall
Waterfall
26.0 km
Twin Lakes (Chicago Basin)
Highlight • Lake
Tip by
27.9 km
North Eolus
Peak
28.4 km
Mount Eolus
Highlight • Summit
The "Catwalk" is the name for the most narrow section on this ridge. Mostly all of the traverse is long stretches of class 2 (including this tight section). There are a handful of class 3 sections as you approach the very top.
Tip by
32.2 km
Sunlight Peak
Highlight • Summit
Tip by
33.8 km
Windom Peak
Highlight • Summit
Tip by
34.9 km
End point
Way Types & Surfaces
Way Types
20.4 km
9.26 km
5.34 km
Surfaces
30.2 km
4.68 km
< 100 m
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Elevation
Highest point (4,210 m)
Lowest point (2,340 m)
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Weather
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Monday 18 May
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This route was planned by komoot.
Frequently Asked Questions
How difficult is the hike to Sunlight Peak, Windom Peak, and Mount Eolus?
This trail system is considered very difficult due to its remote location, significant elevation gain, and the technical nature of the peak ascents. The full round trip from Purgatory is about 36 miles with 10,000 feet of climb. Each peak presents unique challenges:
- Sunlight Peak involves class 3 scrambling, a 'leap of faith' step, and a class 4 mantle.
- Windom Peak is generally the easiest, a class 2+ boulder hop.
- Mount Eolus features 'The Catwalk,' a narrow ridge with significant drops, followed by steep class 3 climbing.
Where does the trail start and where can I park?
The route typically begins at the Purgatory Trailhead, which is accessible by car. From there, you descend to the Animas River. Alternatively, many hikers opt to take the historic Durango & Silverton Narrow Gauge Railroad to Needleton, which significantly shortens the approach hike to Chicago Basin.
What are the main access options for reaching the Chicago Basin?
You have two primary ways to reach the Chicago Basin, which serves as the base camp for the 14ers:
- Hiking from Purgatory: This involves a long, multi-day hike along the Animas River Trail.
- Durango & Silverton Narrow Gauge Railroad: You can take the train to the Needleton stop, which provides a much shorter and less strenuous approach hike into the basin. This is a popular option to save time and energy for the peak ascents.
Is this trail dog-friendly?
Yes, dogs are generally allowed in the Weminuche Wilderness, which this trail traverses. However, it's crucial to keep your dog on a leash, especially in high-traffic areas like Chicago Basin, and to practice Leave No Trace principles by packing out all waste. Be aware that the technical sections on the peaks (e.g., Sunlight's 'leap of faith,' Eolus's 'Catwalk') may be extremely challenging or impossible for dogs.
What is the best time of year to hike this route?
The best time to hike this route is typically from late July through early September. During this period, the snow has usually melted from the high passes, and the weather is generally more stable. Wildflowers are abundant in the Chicago Basin during summer. Earlier or later in the season, you risk encountering significant snow, ice, and more unpredictable weather conditions.
Do I need any permits or pay entrance fees for the Weminuche Wilderness?
No, there are generally no permits or entrance fees required to hike in the Weminuche Wilderness itself. However, if you plan to access the trail via the Durango & Silverton Narrow Gauge Railroad, you will need to purchase a train ticket. Always check the latest regulations with the local Forest Service office before your trip, as rules can change.
What is the terrain like on this trail?
The terrain is highly varied. The initial approach along the Animas River Trail can be overgrown in sections. As you climb towards the Twin Lakes (Chicago Basin), you'll encounter well-defined trails that transition to steep, rocky, and exposed terrain above treeline. The final ascents to Mount Eolus, Sunlight Peak, and Windom Peak involve significant scrambling, boulder hopping, and some technical class 3/4 moves on solid rock and loose scree.
What are some notable features or landmarks along the route?
Beyond the three 14ers themselves (Mount Eolus, Sunlight Peak, and Windom Peak), the Twin Lakes (Chicago Basin) is a spectacular alpine sanctuary and a popular base camp. You'll also encounter the Purgatory Trailhead at the start and the junction of the Purgatory Trail & Animas River Trail. Keep an eye out for tame mountain goats, which are a common sight in Chicago Basin.
Is this a multi-day backpacking trip, and where can I set up a base camp?
Yes, this is almost exclusively undertaken as a multi-day backpacking trip due to its length, remoteness, and difficulty. The most common and recommended place to establish a base camp is in the Chicago Basin, located just below treeline at approximately 11,000 feet. This allows for acclimatization and day trips to summit the individual peaks.
Does this route intersect with other trails?
Yes, the route utilizes several established trails. You'll spend a significant portion on the Animas River Trail, and also traverse sections of the Purgatory Trail and the Chicago Basin Trail. The Needle/Johnson Creek Trail is also part of the network in this area.
Is this trail suitable for beginners, or are there family-friendly alternatives nearby?
No, this trail is not suitable for beginners or families with young children due to its extreme difficulty, remoteness, and technical climbing sections. For family-friendly alternatives in the San Juan Mountains, consider easier day hikes around Durango or Silverton, or trails with less elevation gain and exposure. Always research specific trail conditions and difficulty ratings before heading out.