How hard is Aconcagua to climb? This is a loaded question and one I get asked weekly. I have climbed Aconcagua 10+ times over a 20 year period and happy to get on a call and answer any questions you may have. Aconcagua, at 6,962 meters (22,841 ft), is the highest mountain outside Asia and the tallest peak in both the Southern and Western Hemispheres. On paper, it’s often described as “non-technical”, which leads many climbers to assume it’s an easy step up from trekking peaks or Kilimanjaro.
That assumption is exactly why so many people fail on Aconcagua.
While the Normal Routes do not require ropes or advanced technical climbing, Aconcagua is an extremely demanding high-altitude expedition that tests endurance, preparation, patience, and mental strength. For many climbers, it is harder than they ever expected. You can also check out our Aconcagua page.
What Makes Aconcagua Difficult
1. Extreme Altitude – The Real Challenge
At nearly 7,000 meters, altitude is the single biggest obstacle on Aconcagua. With sustained exposure to high altitude, your endurance, mental and physical are pushed to the limit.
- Oxygen levels at the summit are around 40% of sea level
- Even very fit climbers can struggle without proper acclimatisation
- Headaches, nausea, fatigue, and sleep disruption are common
- Poor acclimatisation is the main reason climbers fail or are forced to descend
Unlike shorter climbs, Aconcagua requires multiple load carries, rest days, and a slow, methodical approach. There is no shortcut here. You either respect the altitude or the mountain will stop you.
2. Length of the Expedition
Aconcagua is not a quick climb. A properly run expedition takes 18–20 days, depending on the route and weather.
This includes:
- Long approach days
- Carrying loads to higher camps and returning to sleep lower
- Multiple acclimatisation rotations
- Waiting for weather windows
The length of the expedition makes Aconcagua mentally as well as physically demanding. Fatigue builds, motivation dips, and decision-making becomes critical.
3. Brutal Weather and Wind
Aconcagua is infamous for its weather.
- Winds regularly exceed 80–100 km/h
- Temperatures can drop to -25°C or colder with wind chill
- Storms can appear suddenly and shut down summit attempts
Even strong climbers are often turned back just a few hundred meters from the summit due to wind or cold. Success on Aconcagua depends heavily on experience, timing, and patience, not just fitness.
4. Heavy Packs and Load Carries
Unlike many guided climbs, Aconcagua still requires climbers to carry significant weight. There are porters available to help with load carries above Base Camp.
Typical loads include:
- Personal gear
- High-altitude clothing
- Food and fuel for upper camps
Load carries are done at altitude, often on loose scree and steep slopes. This is exhausting and places a huge strain on legs, lungs, and recovery.
5. The Summit Push and the Canaleta
Summit day is long and unforgiving. The first couple of hours are straight forward and then steeper up to Inpendencia hut as the sun starts to rise. From we have a shorter zip zag hill up the start of a long traverse to the Cave. This section takes 2 hours. After some rest it takes another 2 hours to climb up through the Canaleta to the summit of Aconcagua. It normally takes 8 hours to reach the summit. We move slowly to converse energy for the descent.
- 12–14 hours round trip
- Starts in the dark
- Extremely cold temperatures
- Slow progress due to altitude and fatigue
The final section, known as the Canaleta, is a steep, loose gully near the top. At 22,000 feet, even a few steps can feel overwhelming. This is where many climbers discover whether their preparation was enough.
All you Need to Know about Climbing Aconcagua
When you are finished here, check out our all you Need to Know page with our most important links on the trip. Aconcagua presents a high level of difficulty and intense weather makes this climb potentially dangerous adventure. Read a post from one of our recent trips.
Aconcagua is Much Tougher than Kilimanjaro
The physical demands for Aconcagua, which stands about 3,500-feet higher than Kilimanjaro, cannot be understated, along with the need for basic mountaineering skills. The summit day is extremely challenging and can take 12+ hours or more from camp and back.
This all after some strenuous load carries of 16kg/ 35lbs and trying to sleep at recover at 4,950m/ 16,240 feet at Camp 1. At 5,500m/ 18,044 feet at Camp 2 and try and rest and recover at Camp 3, 5,992m/ 19,660 feet.
Is Aconcagua Technical?
This is one of the most common questions we get asked. On a numbers of occasions we have had to fix some lines on a part of the traverse and in parts of the Canaleta. This depends on the season.
No – the Normal Route is not technical.
You do not need ropes, ice climbing skills, or advanced mountaineering techniques. These skills are useful and we feel there are important to know before going to Aconcagua.
But that does not make it easy.
Aconcagua is a high-altitude endurance expedition, not a technical climb. The difficulty comes from:
- Altitude
- Weather
- Length
- Load carrying
- Mental resilience
Many strong trekkers and athletes fail because they underestimate these factors.
You Need Previous Experience?
While it is possible to attempt Aconcagua without prior experience, we do not believe it is responsible. Aconcagua is a serious high-altitude mountain, and recent seasons have shown that underestimating it can be fatal.
To ensure safety and success, we require all team members to arrive with proven high-altitude experience and basic mountain skills, gained on peaks such as Kilimanjaro, Cotopaxi, Elbrus, Lobuche or Mera Peak on their climbing resume.
How Fit Do You Need to Be?
You do not need to be an elite athlete, but you do need:
- Excellent cardiovascular endurance
- Strong legs for long uphill and downhill days
- The ability to carry a pack for multiple days
- Mental resilience when tired, cold, and uncomfortable
Training should include:
- Long hikes with a weighted backpack
- Back-to-back training days
- Hill climbing and descending
- Aerobic endurance at steady heart rates
Strength alone is not enough. Aconcagua rewards slow, steady, disciplined movement.
Success Rates on Aconcagua
Summit success rates on Aconcagua vary widely.
- Many independent or poorly prepared climbers have success rates below 30%
- Weather, altitude illness, and lack of experience are the main reasons for not reaching the summit
- Well-run expeditions with strong acclimatization plans and experienced leadership have much higher success rates
Turning around is common — and often the right decision. On Aconcagua, good judgement is more important than summit fever. I have seen people arguing with local guides on many occasions, continue to climb and not survive.
We don’t Manage Speed Ascents on Aconcagua
You need to be willing to put in the hard graft in terms of training. Most days are 6 to 8 hours of hiking in a wide range of conditions all at 30 to 50 degree angled terrain. Learn more about what we require in terms of training, or just get in touch and learn more about the terrain.
- You should consider getting a vo2 max test so you can map out your heart rate training zones
- Map out a targeted training plan 6 months before your expedition
- Train for all the downhill
Too many people are underestimating the training along with picking quicker ascents. Speed ascents should be left to the professionals. Give yourself access to the best itinerary with more acclimatization. This also offers you more summit attempts.
How we get to Nearly 23,000 Feet
The Vacas Valley or Polish Traverse Route is my favorite approach on Aconcagua, and the one we choose to guide most of our trips on. We start in Mendoza and drive up to Penitentes or Puente del Inca to stay and then start the trek into Plaza de Argentina Base Camp 4,200m/ 13,780 feet, from the roadside at 2,407m/ 7,900 feet.
After four nights at Base Camp we move on the southeast side of the mountain. We then traverse across the shoulder of Aconcagua at Camp Colera and descend the West Face.
Our approach incorporates parts of four different routes—The Polish Glacier, Normal, Guanacos, and Ameghino—which allows climbers to experience more of the terrain and stay away from the busier normal route up the mountain.
So, How Hard is it to Climb Aconcagua?
Aconcagua demands serious training and preparation. With a summit success rate of roughly 30%, it is a mountain that quickly exposes a lack of readiness. Reaching the summit requires true mountain fitness — built through endurance training, strength work, and disciplined heart-rate control.
We help our climbers prepare in exactly this way, ensuring they arrive ready to perform safely and consistently at altitude.
Four Important Things to Remember
We only 21-day expeditions to Aconcagua. Our itinerary allows adequate acclimatization to allow you adapt to the low levels of oxygen. Alongside this, our schedule has 4 potential summit attempts.
It also means that we can be flexible about summit day, if faced with bad weather. All that means we have the best chance of a successful summit. Check out the four most important things to know about climbing Aconcagua.
How Fit do I Need to be to Climb Aconcagua?
Fitness is not the most important consideration. What I mean by this is your cardio system should never be massive pressure while climbing Aconcagua until summit night.
On our trips we pace the team to minimize high rates that aid in recovery. We aim to go from point A to point B expending as little energy as possible.
In saying this you will be hiking 6 to 8 hours per day with an extremely challenging summit day of 12 plus hours. Elevations gains will be anywhere from 500m/ 1,640 feet to 1,000m/3,280 feet. Also, some trekking days will be 8miles/ 13km to 16 miles/ 26km hiking out of Base Camp.
Remember you will be carrying a weighted expedition backpack up to 18kg/ 40lbs. It is extremely important that you are comfortable with these distances, weights and elevations gains on a back to back basis in your training. Again, we can help you understand the training needed to be safe and successful on Aconcagua.
Is Aconcagua a Technical Climb?
This season Aconcagua had technical elements with fixed rope on the traverse below the cave and sections of the Canaleta needing ropes. This will vary from year to year. Remember you always need to be prepared for any eventuality.
The more physically and technically prepared you are, the better. Aconcagua is a tough steep climb which should not be underestimated. It is best to have previous experience on ropes, fixed lines, crampons and understand basic mountaineering techniques.
What is Summit Day Like?
To get to the top of Mount Aconcagua 6,962m/ 22,841 feet from Colera Camp 5,992m/ 19,660 feet requires about 12 to 14 hours of strenuous ascent up and down. After climbing this route many times, I can tell you it is challenging from start to finish.
The terrain is steep zig zagging in sections and more direct in the Canaleta. The Canaleta is a steep section high on Aconcagua that leads to the summit and this steep terrain is above 6,700m/ 22,000 feet.
This terrain requires the use of French stepping and the use of the rest step and specific targeting breathing to maintain the correct heart rate to safely reach the summit and have enough energy to get back down safely. Get in touch and we can help you understand this challenging day.
Training for the Downhill
Not everyone will have access to hills, but this is the best way to train your body and legs for the steep down hill hiking on Aconcagua. On Aconcagua there are multiple days where you descend 600m/ 2,000 feet on back to back days.
After slowly moving up the mountain you have to descend from the summit 6,962m/ 22,841 feet back to the car park at 2,743m/ 9,000 feet over 3 days on scree and rock and this is very challenging on your legs and joints.
For sure, the downhill hike will take more wear and tear on your joints and muscles than the uphill. You do need to use effective training techniques to minimize the impact on your body. Descending using good technique means that you move faster and feel lighter. Remember, 80% of accidents happen on the way down. Read more.
Do you think you have what it takes?
You can read all about our expedition to climb Aconcagua here. Too many mountain movies and Netflix documentaries are painting the wrong picture of what it takes to climb big mountains. Make no mistake, Aconcagua is a big mountain.
This stone sentinel, is a beast of a mountain and I have seen it tame athletes and mountaineers. Aconcagua requires disciplined and targeting training for very specific terrain.
I encourage you to get a fitness test or vo2 max test and start building a training plan targeted to specific zone training increasing the weight you carry building overall strength and endurance. Read more.
Why 30% Success Rate?
Firstly, poor weather conditions dismantle expeditions and the biggest factor in terms of low summit success. Secondly, too many people not showing up with the correct training, and physical conditioning requires for such a lofty goal.
Thirdly, poor acclimatization schedules not allowing people enough time to adapt correctly to low levels of oxygen.
Pros and Cons of Climbing Aconcagua
Aconcagua is one of the world’s Seven Summits, the highest mountain on each continent. The summit is a massive feat for any mountaineer. Reaching the summit can be a Life-changing experience for intermediate mountaineers and give confidence to move forward in mountaineering careers.
Aconcagua has proved to be a training ground and benchmark for higher peaks like Manaslu, Cho You and Mount Everest.
The dry desert air makes for a dusty, and challenging experience. Staying well hydrated is one of the biggest challenges and needs to be monitored and measured on a daily basis. On my last trip I was doing a load carry to camp 3 and by camelback froze during the day.
After reaching Camp 3 I started to drink from my Nalgene bottle, returned to camp 2 drank more but not enough. I woke the following morning after expelling more moisture and was dehydrated, tired and knew it. It was time to focus hard to get hydrated with nuun tablets, liquid IV and rehydration salts. Read more about why hydration is critical at high altitude.
What Time of Year is Aconcagua Climbed?
Aconcagua is climbed in the summer months in South America between November and March, the hottest season in the southern hemisphere. In my 20-year experience on Aconcagua January and February have the most favorable weather.
In saying that, the weather changes year to year and day to day. The most important thing is to have more acclimatization and potential summit days available.
When Should I Book my Trip?
Trips should be booked at least six months in advance and preparation and training can build up over a longer period of time.
Check out our upcoming trips. Permits are required from the Argentine government to gain entrance to the Aconcagua Provincial Park and are not included in the trip cost. Our team will secure the permit for you.
Final Thoughts: How Hard Is Aconcagua to Climb?
Aconcagua is hard — not because it is technical, but because it is relentless.
- The altitude is severe
- The weather is unforgiving
- The expedition is long
- Mistakes are punished quickly
For those who respect the mountain and prepare properly, Aconcagua is an incredibly rewarding challenge and a major personal achievement.
For those who underestimate it, it can be a very humbling experience.
If you’re considering Aconcagua and want to give yourself the best possible chance of a safe and successful climb, experience, preparation, and patience are everything.
We have years of experience leading trips to Aconcagua, why not email us today and learn from our experience. Here are some reasons to pick our service and itinerary. We are available 5 days a week in support of your preparation for this unique mountain adventure in Argentina.