Refugio San Bernardo · Vallecitos · Cordón del Plata
Your base to conquer Aconcagua
Acclimatize in the Cordón del Plata before tackling the highest summit in the Americas
Aconcagua: 6 962 meters of pure challenge
Cerro Aconcagua, located in Mendoza province, is the highest point in the western hemisphere and the roof of South America. At 6 962 meters above sea level, it represents the dream summit for climbers worldwide and the greatest high-altitude challenge outside the Himalayas.
Every year, expeditions from Europe, North America, Asia and Oceania converge in Mendoza with one goal: to reach that summit. But Aconcagua does not forgive impatience. Altitude changes everything: the body needs time to adapt, to produce more red blood cells, to breathe air that contains half the oxygen of sea level.
Acclimatization is not an option. It is the difference between reaching the summit and having to turn back halfway.
The success rate on Aconcagua hovers around 40% in normal conditions. The main cause of failure is not lack of fitness, but altitude sickness caused by insufficient or rushed acclimatization.
From Vallecitos to the roof of the continent
The Cordón del Plata offers summits that rise progressively to 5 968 m — the perfect springboard to prepare your body before Aconcagua.
Why the Cordón del Plata is the ideal place to acclimatize
The Cordón del Plata Provincial Park in Vallecitos is one of the best places in the world to prepare for high-altitude expeditions. Its unique geography lets you climb up and down to different altitudes within a few days — exactly what the body needs to adapt.
Unlike other training zones, the Cordón del Plata offers summits from 3 000 to 5 968 meters within easy reach of the refuge. This lets you follow the golden rule of acclimatization: "climb high, sleep low".
Climb high, sleep low. That is how acclimatization works. And in the Cordón del Plata, that is exactly what you can do every day.
Just 80 km from the city of Mendoza, the Cordón del Plata is also logistically perfect: accessible, well documented, with routes of varying difficulty.
From 3 000 to 5 968 meters
The Cordón del Plata is a complete mountain school. From the refuge, you have access to about a dozen summits at different difficulty levels. Each has its own character, route and history.
For all ascents in the Cordón del Plata, hiring a certified mountain guide is more than recommended. Even on beginner peaks, the high-mountain terrain, changing weather and altitude pose real risks. The higher you go, the more a guide becomes a safety decision rather than a luxury. Refugio San Bernardo can help you choose the right guide for your level and goal.
From the refuge's 2 800 meters, you are already in high mountain terrain. Weather conditions in the Cordón del Plata are extremely unstable year round, and especially severe in winter — violent katabatic winds, sudden snowfall, dense fog, temperatures well below freezing. Conditions can change in minutes without warning. Respect for the mountain is not optional.
Summits ordered from easiest to hardest. Respect the progression.
Cerro Andresito
BeginnerFirst step into the mountain. Well-marked trail along the Quebrada del Estudiante, with no technical difficulty. Ideal to get used to the terrain, set your pace, and see how the body responds to altitude.
Part of "La Cadenita"Cerro Arenales
BeginnerSecond step of La Cadenita. Low technical difficulty, accessible trail with views of Potrerillos dam. Can be linked with Andresito and Lomas Blancas in a single day.
Part of "La Cadenita"Cerro Lomas Blancas
BeginnerThe roof of La Cadenita. No technical difficulty, marked trail, direct ascent from the refuges. The first real viewpoint of the Cordón with views of the 5 000-m peaks.
Elevation gain from refuge: +890 mCerro Adolfo Calle
IntermediateThe reference 4 000-m peak of the Cordón. Well-marked trail to the shoulder, then scree to the pyramidal summit. Easier to read and less prone to disorientation than San Bernardo.
Elevation gain from refuge: +1 496 mCerro Stepanek
IntermediateImmediate neighbor of Adolfo Calle, usually linked with it in a long day. Named after Hans Stepanek, one of the first to summit Cerro Plata in 1925.
Linked with Adolfo CalleCerro San Bernardo
Intermediate — with respectThe peak that gives the refuge its name. The trail disappears in sections above 3 700 m, with scree, loose stones and many false paths. Especially treacherous on descent when clouds roll in.
Elevation gain from refuge: +1 380 mCerro Mausy
IntermediateClassic of the Cordón's northern sector, usually linked with San Bernardo in a ridge traverse that demands navigation and good fitness. Excellent viewpoint over the Colorado and Agustín Álvarez peaks.
Elevation gain from refuge: +1 769 mCerro Franke
High altitudeFrom here on, real high-mountain terrain. High 4 000-m peak between Las Veguitas and Lomas Amarillas. The Franke–Lomas Amarillas traverse is a classic of the Cordón.
Elevation gain from refuge: +2 033 mLomas Amarillas
High altitudeTechnically more demanding than Vallecitos and one of the least visited peaks of the Cordón because of its summit-attack difficulties. Usually linked in a traverse with Franke. Full high-mountain gear required.
Elevation gain from refuge: +2 359 mCerro Rincón
High altitudeA goal in itself: not a stepping stone but an expedition with specific preparation. It has its own glaciers and imposing technical walls. Base camp at La Canchita (4 200 m).
Elevation gain from refuge: +2 620 mCerro Vallecitos
High altitudeThe most climbed 5 000-m peak in the Cordón and the most recommended one before Plata. Normal route via the south ridge to the Plata-Vallecitos col. The summit requires a few climbing moves (III° UIAA). Crampons and ice axe needed.
Elevation gain from refuge: +2 669 mCerro El Plata
High altitudeThe highest summit of the Cordón. A 6 to 7-day expedition. Camps: El Salto (4 200 m) and La Hoyada (4 680 m). Summit push starts at 1–2 a.m. Summit day: 10 to 12 hours. Direct view of Aconcagua to the west.
Elevation gain from refuge: +3 168 mYour acclimatization week in Vallecitos
Indicative outline. Every climber is different — the actual pace adjusts to how your body responds to altitude.
Settling into the refuge
Arrival from Mendoza, settling into Refugio San Bernardo. Easy walk in the surroundings. The body starts registering the altitude change.
2 800 mLa Cadenita — first summits
Trekking through Quebrada del Estudiante: Andresito, Arenales, Lomas Blancas (3 690 m). Well-marked trail, no technical difficulty.
Up to 3 690 m — sleep at 2 800 mAdolfo Calle or Stepanek
First 4 000-m peak. Adolfo Calle (4 296 m) and Stepanek (4 194 m) are most recommended as the first step at altitude. Can be linked the same day.
Up to 4 296 m — sleep at 2 800 mActive rest day
The body consolidates the adaptation. Short walk or rest at the refuge depending on how you feel. Nutritious food, constant hydration.
2 800 mHigh camp — El Salto
Carry up to El Salto camp (4 200 m). First night sleeping at altitude. The body is forced to adapt to sleeping with less oxygen.
Sleep at 4 200 mCerro Plata or Cerro Vallecitos
The big day: summit attempt on Cerro Plata (5 968 m) or Cerro Vallecitos (5 469 m). With proper acclimatization, the body already works efficiently at this altitude.
Up to 5 968 mDescent to the refuge
Descent, celebration and recovery. Home cooking, hot shower, and a well-earned night of rest. Ready for Aconcagua.
2 800 mRefugio San Bernardo: where the summit begins
Located at 2 800 meters above sea level in the Vallecitos valley, Refugio San Bernardo is your headquarters for the entire acclimatization week.
Mountain lodging
Shared and private rooms. Everything you need to rest well before and after days at altitude.
Home cooking
Full or half board. Recovery starts at the table: real energy for every mountain day.
Real-time weather
Live camera and Cordón weather forecast available 24/7. Plan every outing with real information.
Local advice
The refuge team knows the Cordón like no one else. Routes, conditions, and contact with certified local guides.
Hot showers
After hours in the mountains, a detail that makes all the difference when temperatures drop.
Living room with wood stove
The meeting space: cozy armchairs, lit fire, conversations between mountaineers from all over the world.
Before you climb: what you should know
Hydrate more than you think you need. At altitude, the body loses fluids faster. Minimum 3 liters per day, more on ascent days.
Climb slowly, slower than you want. If you can speak while climbing without losing your breath, you are at the right pace.
Listen to your body. Persistent headache, nausea, disorientation: these are signals to descend, not to ignore. The mountain will still be there tomorrow.
Don't underestimate prior acclimatization. Arriving in Mendoza a few days early, at 750 m, already helps. Many climbers also stop in Potrerillos.
Sleep is part of the training. It's normal not to sleep well the first nights. What matters is to rest without forcing.
Acclimatization is cumulative. A week in the Cordón can make the difference between reaching the Aconcagua summit or not.
Start your expedition where it should begin
Refugio San Bernardo welcomes climbers during high season (November to March). Spots are limited — book in advance to secure your base.
Refugio San Bernardo · Vallecitos · Luján de Cuyo · Mendoza, Argentina · 2 800 m