I want to be clear, high on Aconcagua is steep and challenging terrain. The team has been doing 6 and 7 hour days with minimal recovery at high altitude. You have been carrying up to 17kg/ 37lbs and then you have a 12+ hour summit day. Yes, it is hard work!
Here are 20 things to know before climbing Aconcagua. Climbing Aconcagua, the highest peak in the Americas, is a formidable challenge that requires excellent acclimatization and physical preparation.
With over 20 years of experience leading expeditions to this 6,962-meter (22,841 feet) summit, I’m here to share the essential tips that will help you get the most out of your Aconcagua climb. Contact us for further information.
Why Aconcagua Is One of the Most Challenging Climbs in the Americas
Rising to 6,961 metres (22,838 feet) above sea level, Aconcagua is the highest mountain in the Americas and the highest peak in the world outside the Himalaya and Karakoram ranges. Despite being climbed without technical ropes on its easiest line, Aconcagua is a true high-altitude expedition, not a trek.
Oxygen availability at the summit drops to approximately 40% of sea-level values, placing enormous stress on the body and making proper acclimatization, pacing, and decision-making critical to success. The mountain is infamous for its volatile weather systems, where calm mornings can rapidly deteriorate into white-out conditions, extreme cold, and ferocious winds often exceeding 100 km/h. These factors, combined with prolonged exposure above 20,000 feet (6,000m), are what make Aconcagua a serious challenge even for strong, experienced climbers.
Each season, several thousand climbers attempt Aconcagua, yet average summit success rates remain between 30–40%, primarily due to altitude illness, poor preparation, and aggressive itineraries. The Normal Route, ascending the northwest ridge, is the most popular and least technical option, but it demands exceptional physical endurance and disciplined acclimatization.
The Vacas Valley Traverse offers a longer, more remote expedition with superior acclimatization opportunities and is often favored by experienced guides for its higher success potential when managed correctly. For advanced mountaineers, the Polish Glacier Route provides a steep, technical ascent involving sustained snow and ice climbing in a far more serious alpine environment. Having led multiple expeditions on Aconcagua each year, we have seen first-hand that success on this mountain is determined far less by strength alone and far more by experience, patience, and respect for altitude.
There are Two Main Routes
When deciding between the Normal Route, Traverse Route, or the challenging Polish Glacier route on Aconcagua, it’s important to consider your climbing goals. Do you want to experience as much of the mountain as possible. Are you seeking a tougher challenge to prepare for even bigger climbs? Are you looking to carry less weight and just give the summit a shot?
If you’re looking for the most straight forward Aconcagua ascent, the Normal Route may be best for you. However, if you’re testing high-altitude, and how you perform carrying more weight at altitude for a trip like Denali or Mount Everest, the Vacas valley traverse route is for you.
Aconcagua is an expedition that can push your limits at extreme altitude, the Polish traverse might offer the ultimate challenge for you. There are pros and cons to both routes. Learn more.
Top Tips For Climbing Aconcagua
These Aconcagua tips are based on 20 years of expertise climbing this formidable peak. As someone who has climbed Everest, summited 6 of the 7 summits, and led over numerous successful expeditions to Aconcagua, I can assure you that acclimatization and preparation are key to success on this challenging mountain.
1) Acclimatization Is Everything on Aconcagua
At 6,961 metres (22,838 feet), Aconcagua is first and foremost an altitude mountain, and proper acclimatization is the single most important factor determining whether climbers reach the summit safely. Most successful expeditions spend 16–20 days on the mountain, allowing the body time to adapt to progressively lower oxygen levels. Without a well-managed acclimatization schedule, climbers are at high risk of Acute Mountain Sickness (AMS), which can escalate quickly into far more serious conditions such as HAPE or HACE. Common early symptoms—headaches, nausea, dizziness, loss of appetite, and disturbed sleep—are not signs of weakness, but warning signals that must be respected and managed correctly.
On Aconcagua, rushing the ascent is the most common reason climbers fail or are forced to descend. Our itineraries are deliberately designed with extra acclimatization days, multiple rotations between camps, and conservative altitude gains to maximize both safety and summit success. We even recommend doing some hypoxic training before the trip or even a few days in Quito before fly to Mendoza.
After leading numerous expeditions on the mountain, we have seen time and again that strong, fit climbers who move too fast are far more likely to struggle than those who pace themselves properly. Acclimatization is not an optional extra on Aconcagua — it is the foundation of every successful climb.
2) Choosing the Right Route on Aconcagua Matters
Aconcagua offers several routes to the summit, and choosing the right one for your experience level, fitness, and objectives has a major impact on safety, enjoyment, and summit success. The Normal Route is the most commonly climbed and is considered non-technical, meaning no ropes or technical climbing skills are required under normal conditions. However, this should not be mistaken for an “easy” ascent. The route demands excellent endurance, strong mental resilience, and a solid ability to perform for long days at extreme altitude, particularly during the summit push from high camp.
For experienced alpinists seeking a more technical challenge, the Polish Glacier Route is a true mountaineering line, involving sustained steep snow and ice climbing, fixed ropes, and significantly greater objective risk. This route requires prior alpine climbing experience, proficiency with crampons and ice axe, and comfort operating in a more serious environment.
The Vacas Valley Traverse offers a longer, more remote approach to the mountain, with heavier loads carried during the initial stages of the expedition. While physically demanding early on, this route benefits from fewer crowds, a warmer base camp, and superior acclimatization opportunities, which can translate into stronger performance higher on the mountain when managed correctly.
Selecting the right route on Aconcagua is not about choosing the “hardest” or the most popular option — it’s about choosing the route that best matches your skills, preparation, and long-term goals. After many seasons guiding on the mountain, we have found that climbers who choose routes aligned with their experience and follow well-paced itineraries consistently have safer, more successful, and far more rewarding expeditions.
3). Prepare for Harsh and Unpredictable Weather
Aconcagua is infamous for its unpredictable weather, especially in the upper camps. Aconcagua sits in a high desert, so the climate is extremely dry. On the way to Base Camp, you can experience searing heat and cooler temperatures at night. If can be 80F on the way to Base Camp and then -18°C (0F) at Camp 3, Camp Colera and colder higher up with the wind chill.
Storms, high winds, and temperatures as low as -30°C (-22°F) can occur. It’s crucial to be prepared for sudden weather changes on Aconcagua. Make sure you bring high-quality, cold-weather gear, including -29 C (-20F) sleeping bag, the correct layers, down gear, gloves and layers.
Watch our packing video and we provide a 40 page dossier, with itemized kit list on signing up.
4). Training for the Ascent
Aconcagua requires a high level of physical conditioning and excellent endurance. It’s not just about being able to hike up; you need to have the endurance to keep going for long hours, on steep terrain at High and extreme altitude. Learn more.
Incorporate endurance training, hiking with a weighted backpack, training for the downhill and specific gym training. Hypoxic training right before your trip is also a very useful tool. After climbing Aconcagua 10+ times I can tell you a lot of people underestimate this mountain. You need to be physically prepared for the long days carrying weight on the mountain.
We recommend a step-by-step approach to climbing Aconcagua and here is our advice as you prepare for your Aconcagua expedition.
5). Prepare for the Descent
Carrying heavy can put a lot of strain on your knees and legs. Downhill training is crucial, as fatigue during the descent can lead to accidents. Include lots of downhill training in your preparation to make sure your body can handle the challenge. Obviously hiking downhill with weight at a similar angle to Aconcagua will be the best preparation alongside specific let strengthening exercises.
The descent days on Aconcagua are more direct on steep terrain. This means you need excellent leg strength for these descent days. Coming down from 6,962 meters to 4,400m over two days and then a long 15mile hike to the road for the drive back to Mendoza is no easy task, especially after multiple days of carrying heavy weight at high altitude.
6). Packing Strategically is Key
Packing light yet effectively is essential. The temperatures vary greatly between base camp and the summit, so layering is critical. You’ll need a -20°F (-27°C) down sleeping bag, an insulated down parka, and high-quality double mountaineering boots and expedition mitts.
Make sure your gear is of high quality, lightweight and appropriate for extreme conditions. Also make sure you have tested each piece of kit on other mountains and at home. Watch our Aconcagua packing video.
Pro Tip: It is important to weight all the gear and kit that you will be carrying above Base Camp. I have seen people at Base Camp with anywhere from 13kg to 20kg of personal gear to move up through the camps and back to Base Camp. Know the exact weight you will be carrying on above Base Camp.
7). Hiring a Reputable Guide Service
Hiring an experienced guide service is crucial for success on Aconcagua. Our guides are full time mountaineers, and we send professional guides from Ecuador, USA and Nepal. All our guides are highly trained in dealing with altitude, weather, and safety on Aconcagua.
A good guide will monitor your acclimatization, manage camps, and ensure that everyone stays safe. They will also not allow team members ascend when there is a risk to themselves and other team members.
We have a 90% success rate on Aconcagua when the weather allows us reach the summit. This success on Aconcagua comes from careful planning and the best guides in the business.
8). Hydration is Critical
Dehydration at altitude increases the risk of AMS and can sap your energy. On Aconcagua, the dry air, increased respiration and exertion can cause rapid fluid loss, so you need to stay hydrated.
Drink at least 4 liters of water a day and use electrolyte supplements to maintain your body’s salt balance. Keeping hydrated helps prevent headaches, fatigue, and other altitude-related issues. Learn more about why hydration is critical at high altitude. We recommend have nuun tablets, liquid IV or similar for daily use.
9). Nutrition Plays a Vital Role
Fueling your body in your training and on Aconcagua is just as important as hydration. High-altitude trekking requires a diet rich in carbohydrates, proteins, and healthy fats. Learn more.
You’ll need plenty of snacks like nuts, energy bars, and dried fruits to sustain your energy levels on long days. I like using Clif shot blocs on the summit night.
10). Rest is Just as Important as Climbing
Rest days in your training are so important and essential part of the acclimatization process on Aconcagua. They allow your body to adjust to the altitude while you recover from the physical strain of carrying heavy weight at High Altitude.
Sleep is often difficult at high altitude. You need to consider taking Diamox, you need to consider having ibuprofen and manage your hydration correctly. Also make sure to bring earplugs and eye masks to improve sleep quality in the busy camps.
11). Mental Toughness is Key
The climb is as much a mental challenge as it is a physical one. Aconcagua’s altitude and harsh environment can wear you down. I feel the mental toughness comes from hours of physical preparation. It also comes from having the correct attitude and mindset. You need to hit the wall in your training and feel uncomfortable as you prepare for an Aconcagua expedition.
On the mountain you need to stay positive, break the journey into smaller, manageable steps, and lean on your teammates for support.
Remember you need to conserve energy for the final days of the trip. Do everything slowly and be in no rush to go high on the mountain. Patience and having a relaxed attitude aid your summit success. Your mental preparedness will be tested on the summit night and day on Aconcagua.
This long, tough, challenging 12-hour event requires a relaxed approach. The better prepared you are the easier the ascent and descent will be.
12). Layering is Essential
The temperature on Aconcagua fluctuates greatly between the trek into Base Camp, between camps and high on the mountain. Layering and having the correct lightweight equipment is the best way to manage the changing temperatures. Read more about how we layer on Aconcagua.
Make sure you stay covered up from the sun as much as possible. Wear a sun hoody, cover your hands, legs and do not get sun burnt.
Higher on the mountain, start with a moisture-wicking base layer, I use 260 merino. I then add a down vest. Then add insulating layer like a Patagonia nano jacket. On top of these three layers you can add a down parka. As an outer layer you may need a wind proof jacket that goes over all these layers.
13). Invest in High-Quality Footwear
Your feet will be your most valuable asset on Aconcagua. Invest in high-quality mountaineering boots that are insulated and compatible with crampons. If you are joining one of our trips, we require double mountaineering boots.
These will protect your feet from the extreme cold and provide the support needed for the rugged terrain.
14). Know the Symptoms of Altitude Sickness
Altitude sickness can hit anyone at any time, regardless of fitness level. Be aware of the symptoms, which can include headaches, dizziness, nausea, shortness of breath and confusion. We have seen HAPE and HACE at Aconcagua Base Camp and above.
If symptoms worsen, you must descend. From my experience things do not improve. Listen to you body and if the guides tell you to turn around you must follow their instructions.
We carefully monitor all climbers and provide emergency oxygen if needed, but it’s essential to recognize the signs early. Learn more.
15). Respect Your Guides
Your guide’s knowledge and experience are invaluable. They know the mountain’s risks, dangers and the safest way to approach the summit. The guides are there to manage the pace and safety of each climber.
They are not there to be told what to do. Respect their decisions, especially if they advise you to descend for your own safety. We are trying to develop a team of climbers, not individuals.
As we approach an Aconcagua expedition as a team, you need to respect the team and don’t add risk. Be a team player.
16). Respect the Mountain
I can assure you that Aconcagua is a worry opponent and you will find out if you go high on this mountain. Aconcagua is a protected area, and we follow strict Leave No Trace principles.
Carry out all waste and do not litter. Be respectful of the fragile environment, especially at the higher camps where the ecosystem is most vulnerable.
17). Sleeping Above 4,000m
Sleep becomes increasingly difficult at high altitude. The higher you go, the harder it is for your body to rest and recover. Ensure you have a comfortable sleeping system and consider using Ibuprofen or other medications to aid sleep at altitude.
18). Getting to Mendoza and Permits
Your Aconcagua expedition starts in Mendoza, Argentina. If you are on one of our trips we will pick you up from the airport and escort you to the Diplomatic Hotel. Our team in Colorado will have secured your permit before arrival in Mendoza, we will do all the paperwork needed to secure this permit to climb.
The permit cost varies depending on the season, so plan ahead and secure it early. From Mendoza, you’ll head to Puenta del Inca or Penitentes, the staging area for the climb.
19) Be Prepared for Summit Day
I have climbed Everest, Kilimanjaro 40+ times and I can tell you that Aconcagua is much tougher than Kilimanjaro. Summit day on Aconcagua is long and demanding. We normally start in the dark at 5am and you will not return to the camp until 5pm.
Initially the terrain is straight forward as you spend the first three hours to reach Independencia. It takes another 2 hours 30 minutes to reach the cave and another 2 hours to reach the summit of Aconcagua. With breaks it normally takes 8 hours to reach the summit of Aconcagua.
We start around 4am to have enough day light to get up and down safely. It is also important to have good visibility as we reach the traverse to the Cave and going through the Canaleta.
The altitude will be extreme above 22,000 feet. Make sure you are well-acclimatized, have plenty of food and water, and have layered appropriately. Summit success depends on careful preparation and patience.
While mules carry gear to base camp, porters are available for higher camps. Our porter services ensure clients can focus on the climb rather than being weighed down by heavy loads. Contact us for further information.
20. Why Choose Ian Taylor Trekking?
With 20 years of experience on Aconcagua, Ian Taylor Trekking has developed an exceptional program tailored to both novice and experienced climbers. Our success is built on expert guidance, acclimatization strategies, and personalized support, ensuring you’re in the best hands for a successful summit.
Sign up and gain access to our 40 page dossier with all the details you need to know about being successful on Aconcagua. We look forward to guiding you on Aconcagua and hope this guide was useful as you plan your Aconcagua expedition.
Contact us and learn more about how to prepare for the adventure of a lifetime, trusting in the expertise and proven track record of Ian Taylor Trekking.