In Aysén, mountaineering and trekking are experienced on a grand scale: active glaciers, ancient forests, fjords, turquoise lagoons, and jagged peaks create a wild landscape where every day is an adventure. The region is traversed by the Carretera Austral (Southern Highway) and boasts legendary routes such as Cerro Castillo, Glaciar Exploradores, and Queulat National Park, as well as less-traveled options like the Ruta del Avellano (Hazelnut Route) or the Las Horquetas trek . Here's a comprehensive guide to help you choose your itineraries, timings, and logistics, ensuring you have everything you need on the trail.
To give you some context, it's worth remembering that Chilean Patagonia stretches from Puerto Montt to Cape Horn, and Aysén is right in its heart. Its vast size, the complex terrain, and the long distances involved mean you need to plan carefully: it's better to select a few places and enjoy them thoroughly than to try to see everything in a rush. As the local saying goes, going in a hurry here is a waste of time. The content of this guide has been recently revised (updated on January 2, 2025 ) to reflect current schedules, access points, and routes.
When is the best time to travel to Aysén for mountaineering and trekking?
If you have a choice, the Southern Hemisphere summer (December to February) offers the most pleasant window: long days, more services open, and a lower probability of storms . Spring and autumn bring beautiful colors and fewer visitors, but the weather is more unpredictable, and some activities (such as boat trips or high-altitude access) may be limited. In any case, the weather changes quickly; check the high-mountain weather forecast and travel with a buffer and a backup plan to reschedule days if strong winds or persistent rain appear.
How many days do you need? A week will allow you to discover a representative part of Aysén, although you could easily stay for months. It's best to be conservative with the number of stops and prioritize key routes based on your skill level and available time. If you plan to rent a car, it's a good idea to use a comparison website to see prices and terms from different companies , and book in advance during peak season.
Chilean Patagonia is part of the Route of Parks , a corridor of protected areas of monumental beauty. In Aysén, the Northern Patagonian Ice Field, the Southern Patagonian Ice Field, and the San Valentín Glacier system converge, concentrating a huge portion of the planet's surface freshwater . For this reason, many itineraries combine temperate rainforest, fjords, glaciers, and glacial valleys in a single trip.
If you're going to drive, remember that some sections are still gravel and that there may be frost in the mornings during winter. Plan your refueling stops and check road conditions, and if you intend to cross into Argentina, arrange for mandatory insurance and authorization for your rental car.
Essential routes, peaks and treks in Aysén
Below you'll find the most challenging trails, peaks, and experiences in the region and surrounding areas, with practical notes, times, and difficulty levels. Combine them according to your fitness level and always leave a buffer day in case the weather forces you to stop.
1) Cerro Castillo National Park
The classic ascent to Laguna Cerro Castillo begins 4 km from Villa Cerro Castillo. It's approximately 13 km round trip with an elevation gain of 1.122 m. The park opens at 07:00 AM, with the last entry for the ascent at 13:00 PM. The effort is considerable but manageable for hikers with basic experience; allow about 4 hours to reach the main viewpoints and slightly less for the descent, depending on pace and conditions. The views of the turquoise lagoon, nestled beneath the rocky spires, are unforgettable.
If you're looking for something more challenging, the Cerro Castillo circuit can be completed in 4-5 days with camping. It's a demanding trek, ideal for those who have already completed multi-day hikes and are good at weather and navigation. Simple accommodations are available in the village for before/after the hike; for example, Hospedaje Jenaro offered rooms with breakfast at a moderate price. Book during peak season.
2) Exploradores Glacier (Laguna San Rafael National Park)
A 6- to 8-hour trek on the ice of the Northern Patagonian Ice Field. The meeting point is 52 km from Puerto Río Tranquilo , along the road to Bahía Exploradores. With guides and equipment (crampons), you'll traverse the glacier, exploring caves, crevasses, and small lagoons , depending on conditions. It's a moderately strenuous activity, suitable for those who are fit and accustomed to walking on uneven terrain.
Heads up on logistics: at kilometer 75 of Route X-78 towards Bahía Exploradores, there's a very narrow bridge that doesn't allow large vehicles like RVs to pass. Bring waterproof clothing and warm layers, even if the day starts clear. Ice is always a factor.
3) Queulat National Park
Queulat means “sound of waterfalls” in the Chono language, and its main attraction is the Hanging Glacier . There are three clearly defined trails. The 50-meter Universal Accessibility Trail is flat and offers a direct view of the glacier, making it ideal for everyone. The Trail to Laguna Témpanos takes about 30 minutes round trip and includes crossing a suspension bridge; from the shore, you can book a boat trip that takes you closer to the glacier (price range around 15.000 CLP).
The most demanding route is the Ventisquero Viewpoint Trail , about a 3-hour climb through evergreen forest to a natural balcony overlooking the ice. Wear sturdy footwear and don't underestimate the dampness of the terrain. The views are worth every step.
4) Alerce Trail
North of Aysén, along the Carretera Austral, you'll find this short and beautiful hike: 1,4 km total, 40 minutes round trip , completely flat. Walk along wooden walkways and bridges constructed from fallen larch trees to protect these monumental trees, some up to 3.000 years old . The species has been protected by law since 1976; the route is a perfect reminder of why preserving native forests is essential.
5) Los Maquis Waterfall and Baker-Nef Confluence
Around Puerto Guadal, the cascade of waterfalls and pools of the Maquis awaits, a truly photogenic spot. The trails are clear at the beginning, but the signage becomes less frequent further in; proceed with caution. From several natural terraces, you can see General Carrera Lake and, on a clear day, Mount San Valentín.
The Baker-Nef Confluence is one of those must-see stops when traveling the Carretera Austral. It's practically flat and takes about 30 minutes round trip. The contrast between the turquoise waters of the mighty Baker River and the glacial sediment-laden waters of the Nef River is striking. A classic Patagonian postcard scene right by the roadside.
6) Hazelnut Route
Adventure territory north of General Carrera Lake (Chelenko). A 13,5 km trail, taking 4 to 6 hours depending on pace , crosses wetlands and the Avellano River, through lenga forests and clearings with panoramic views. It begins on an old logging road that descends towards Mallín El Alto , at 1.200 m above sea level, and reaches a moraine that offers a balcony overlooking the granite towers of Avellano. There are suitable spots for camping, such as at Mallín Grande.
7) Las Horquetas Crossing
A multi-day experience, ideal for those seeking total immersion. The 53,5 km route is spread over 4 days and 3 nights, with five designated campsites. Access is via a private property in Horquetas Grandes , 70 km south of Coyhaique, right on the Carretera Austral. Native forest, rivers, viewpoints, wildlife, and tranquility: a journey that encapsulates the essence of Patagonia. Plan permits and logistics before setting out.
8) CMPC “El Cóndor” Park (Cerro Negro, Coyhaique)
Located 13 km from Coyhaique, this recreational area is open daily from 08:00 AM to 20:00 PM (last entry at 19:00 PM). It's perfect for an active day with trekking, trail running, and mountain biking , as well as viewpoints and picnic areas. The Lengas Trail is suitable for families and ends at Plaza de las Nodrizas ; the Cerro Negro Trail is of medium difficulty and culminates at a summit with 360° views. An ideal all-rounder near the regional capital.
9) Marble Chapels, San Rafael and Valle Los Leones
In Puerto Río Tranquilo, you can book boat trips to the Marble Caves, a collection of carbonate formations sculpted by water in General Carrera Lake. Important: On windy days, boats do not operate for safety reasons. Allow extra time in your schedule to reschedule. On clear days, it's one of the most beautiful water experiences in southern Chile.
From Puerto Chacabuco, boats depart for Laguna San Rafael, with the glacier of the same name as the destination. It's a long day, but seeing the ice of the Northern Patagonian Ice Field from the water is breathtaking. Another less crowded option is the Los Leones Valley (south of Puerto Tranquilo), with hikes and horseback riding to the lagoon and glacier of the same name.
10) Route of the Valleys (northeast of Aysén)
Around La Junta, in the Cisnes commune, a network of trails winds through pristine glacial valleys , with lagoons, rivers, waterfalls of pure water, and evergreen forest. Patagonian rural culture remains alive here, a legacy of colonization over 70 years ago, set against the backdrop of the Barros Arana mountain range . It's the perfect getaway for those seeking complete disconnection and unspoiled nature.
11) Puyuhuapi, Raúl Marín Balmaceda, Puerto Cisnes and more stops on the Austral
The Puyuhuapi Fjord combines hot springs, Queulat National Park, and pastries inherited from settlers (famous kuchen). A budget-friendly accommodation recommended by travelers is Hospedaje Don Claudio (+56 966258575), with good Wi-Fi, a shared kitchen, and readily available coffee and jam.
Puerto Raúl Marín Balmaceda , a small island at the mouth of two rivers where they meet the sea, is a haven where time seems to slow down: trails, an endless beach, and delicacies like homemade bread and mussel empanadas . A simple accommodation option is Hostal El Viajero (+56 984206181), with basic rooms, a shared kitchen, and unreliable internet. Online reservations are not usually accepted.
Puerto Cisnes hosts the Fried Fish Festival, very popular in the area; check the dates if you're passing through. And in La Junta , you'll find hot springs (El Sauce) and the Lago Rosselot National Reserve. These are good bases for exploring other destinations to the north and south.
12) Aysén–Puerto Chacabuco and navigation to San Rafael
From Aysén and the port of Chacabuco, you can sail to the San Rafael Glacier, an unforgettable experience that brings you face-to-face with the Northern Patagonian Ice Field. It's advisable to book in advance. If you're staying in Coyhaique, there's a variety of options; many travelers recommend well-maintained hostels like Mente Nómade for their cleanliness and both private and shared rooms.
13) Río Tranquilo, Cochrane, Caleta Tortel and Villa O'Higgins
In Río Tranquilo, you'll find basic services and several cabins; Cabañas Lucy (+56 976506262) is a budget-friendly option with excellent kitchen and cleanliness (no online reservations, cash only). From Cochrane, you can stock up on supplies and visit Patagonia National Park or the Tamango Reserve, or go rafting on nearby rivers. Caleta Tortel is captivating with its wooden walkways along the fjord's edge and its timeless atmosphere (it rains a lot). Villa O'Higgins marks the land end of the Carretera Austral; from there, you can either return by road or cross on foot to El Chaltén via a border trek.
How to get to and around the Carretera Austral
The main air gateway to the region is Balmaceda Airport , 55 km southeast of Coyhaique, with daily flights from Sky and Latam. From Balmaceda, Route X-697 (a gravel road) leads to the Austral Highway in 12 km; this is a useful shortcut to connect with your itinerary. If you are traveling with a rental car and plan to cross into Argentina via the Huemules Pass , arrange insurance and permits with the rental company.
The road from Coyhaique to Villa Cerro Castillo is 64 km and is entirely paved. From there south, the roads are mostly gravel, well-maintained but slow; drive carefully and carry at least one spare tire . There are no gas stations in Cerro Castillo; however, there is one in Puerto Río Tranquilo, which is 223 km south of Coyhaique. In autumn/winter, take extra precautions due to morning frost.
For the journey to Bahía Exploradores, remember the narrow bridge at kilometer 75, which prevents very wide vehicles from passing. If you're traveling in a large camper, check for alternative routes. And if you plan to connect with a boat trip, arrive at the departure port the afternoon before to avoid surprises due to wind or service disruptions.
Route map? Even if you don't always have a stable signal, downloading offline maps of the region and the parks will save you from unpleasant surprises. Many routes in this guide are also within protected areas with marked trails . Even so, always carry a GPS tracker, headlamp, warm clothing, and a proper waterproof layer.
For more institutional information and suggested itineraries, you can consult this resource: Download PDF . It's a good supplement for preparing variations and points of interest.
Extensions through Chilean Patagonia: Lakes and Magellan
Although this guide focuses on Aysén, you might be tempted to combine sections further north (Lake Region) or south (Magallanes). We've included the essentials so you can choose your own final destination.
Lakes Region
In northern Patagonia, Hornopirén National Park offers volcanoes, lakes, and hot springs (Llancahué). From Chaitén, you can climb the volcano that transformed the landscape in 2008 and visit Pumalín National Park and the El Amarillo Hot Springs. Further east, Futaleufú is synonymous with world-class rafting and mountains like Sierra Teta, Mirador, and Garganta del Diablo, as well as several trekking trails. Villa Santa Lucía, affected by a major mudslide in 2017, is now a gateway to the Yelcho Glacier and its namesake lake.
If you venture to the Chiloé archipelago , set aside at least a week: fishing villages with stilt houses, deserted beaches, the Muelle del Alma (Pier of the Soul), penguin watching, and Chilote cuisine will be your constant companions. The views of the Andes Mountains from the Chilote coast on clear days are another gem.
Aysén Region (route and accommodations)
In addition to the mountain trails, remember these stops: Puerto Cisnes with its Fried Fish Festival; La Junta as a hub for connections; and the Aysén-Puerto Chacabuco route for sailing to San Rafael. In Coyhaique, many travelers use the city for car rentals and shopping (food and trekking gear). In Río Tranquilo, check the daily wind forecast before booking boats.
Magallanes Region
Puerto Edén is a world apart: car-free, with wooden walkways and a tranquility that seems to stop time. You can arrive by ferry from Caleta Tortel or Puerto Natales and stay for a few hours or several days. There's a guesthouse run by Patricia Negüe next to the dock (contact: +56 9 9413 7131; her daughter Deisy's WhatsApp: +56 9 6685 2737). A secluded and authentic experience.
In Puerto Natales , the gateway to Torres del Paine, finding accommodation for overnight stays on the trails can be tricky, but it's manageable if you book in advance. If not, you can always opt for day hikes . Add a visit to the Milodon Cave and a boat trip to the Balmaceda and Serrano glaciers. In Punta Arenas , set aside time to see penguins: the Magellanic penguin colony on Isla Magdalena or the king penguins in Porvenir (Tierra del Fuego) are two memorable excursions.
At the southernmost tip of the world, Puerto Williams boasts the title of the southernmost city in the world, directly across from Ushuaia. From there, you can sail to Cape Horn, reach Puerto Toro, or hike the Dientes de Navarino , a wild and relatively uncrowded trail. For accommodation with a refuge-like atmosphere, consider El Padrino (managed by Cecilia; WhatsApp +56 9 8438 0843). Keep in mind that there is little to no internet connectivity and many services operate on a more traditional model.
Quick route tips
- Between Coyhaique and Cerro Castillo The road is paved; to the south it is mostly gravel: drive calmly and check your tires.
- No gas station in Cerro Castillo; refuel in Puerto Río Tranquilo or Coyhaique before going down.
- El narrow bridge From km 75 of the X-78, the passage of wide vehicles towards Bahía Exploradores is limited.
- If you cross into Argentina by Huemules, arrange insurance and permit for the rental vehicle in advance.
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Aysén encapsulates everything you imagined Patagonia to be, and more. Choose a suitable season, create an itinerary with some flexibility , and combine classic destinations (Cerro Castillo, Marble Caves, Queulat) with less-traveled gems (Hazelnut Route, Los Maquis, Las Horquetas). If you travel prudently along the Southern Route, coordinate your sailing trips, and respect weather conditions, you'll experience an intense and liberating journey amidst mountains, ice fields, fjords, and legendary forests.