Choosing the route to the summit of Ojos del Salado Volcano (6,893 m) is a decisive logistical decision to make before you set foot in the Andes. Although the summit sits exactly on the border between Chile and Argentina, tackling the mountain from Copiapó (northern Chilean side) or from Fiambalá (southern Argentine side) completely changes the character of the expedition.
After more than two decades organizing climbs in the Puna de Atacama, at Vulcano Expediciones we know the operational requirements, the bureaucratic traps and the differences in terrain between the two slopes.
Comparison: Chilean Side (Copiapó) vs. Argentine Side (Fiambalá)
Climbing from Chile out of Copiapó offers mature logistics built on 4x4 trucks that drop the gear at 5,200 meters, wood and metal huts at altitude, and a final climb on vertical rock (II°/III° UIAA) protected with fixed ropes at 6,870 meters. The Argentine side from Fiambalá, by contrast, demands a pure self-sufficiency traverse, with long days on foot over unstable scree, unsheltered southwest winds and tent camps with no fixed huts for support. While Chile simplifies the bureaucracy with free digital border paperwork, Argentina requires you to sort out truck transfers along desolate quebrada tracks and to carry all the equipment without any commercial infrastructure.
| Factor | Chilean Side (Copiapó) | Argentine Side (Fiambalá / Catamarca) |
|---|---|---|
| Urban Starting Point | Copiapó (Atacama Region) | Fiambalá / Tinogasta (Catamarca Province) |
| Main Road Access | Paved Route CH-31 up to Laguna Verde | National Route 60 (Seismiles Route) |
| 4x4 Vehicle Logistics | Vehicle reaches Campamento Atacama (5,200 m) and Tejos (5,830 m) | Vehicle enters via Cazadero Grande / El Arenal (4,800 m) |
| Hut Infrastructure | Refugio Murray (4,340 m), Atacama (5,200 m) and Tejos (5,830 m) | No fixed huts on the ascent route (100% tent) |
| Permits and Bureaucracy | Free DIFROL paperwork + notice to CONAF and Carabineros | Mandatory registration with Gendarmería Nacional (Las Grutas) |
| Final Summit Stretch | Technical rock pitch (12 m chimney, II°/III° UIAA) | Steep scree and granite blocks on the south slope |
| Water Availability | Springs at Atacama and snow at Tejos / Laguna Verde | Melting peninsular snow or hauling water in jugs |
| Level of Isolation | Moderate traffic of international expeditions | Absolute solitude, virgin and wild surroundings |
| Suggested Duration | 13 to 15 days (with 4x4 acclimatization) | 14 to 16 days (greater physical demand on foot) |
💡 Field experience: The Chilean side saves an enormous amount of physical wear in the stages before summit day thanks to 4x4 support up to 5,200 meters. However, the final chimney on the north route demands composure: climbing that rock wall at almost 6,900 meters wearing a thick down jacket and triple boots does not forgive rope-handling mistakes. On the Argentine side you don't face that vertical wall, but the endless scree of the south face wrecks your legs long before you reach the ridge.
1. Approach Logistics and 4x4 Terrain
The transport to the base of the mountain determines how much energy you have stored up for the final attempt.
North Side via Copiapó (Chile)
Starting from Copiapó, the paved CH-31 road climbs the quebrada to the San Francisco Border Complex. In a few hours you reach the operational base at Laguna Verde (4,340 m). From there, the approach runs entirely on sand tracks and volcanic scree suitable for well-equipped 4x4 trucks.
The vehicle drives straight up to Campamento Atacama (5,200 m). If the track has no penitentes or slabs of hard snow, you can keep driving up to Refugio Tejos at 5,830 meters of altitude.
South Side via Fiambalá (Argentina)
The access starts in the Catamarca town of Fiambalá. Going up the legendary National Route 60 —the backbone of the Seismiles Route in Argentina— you climb the Quebrada de Chaschuil. To explore the trans-Andean cartography in full, the huts on both sides of the border and the location of the neighboring summits, you can use our Interactive Map of the Seismiles Route.
To head into the volcano, vehicles must turn off toward Cazadero Grande or the El Arenal area. Argentine terrain is rougher on the vehicles: dry riverbeds, loose rockfields with no track maintenance and dune fields at 4,800 meters. Except for highly specialized convoys, most of the high approach is completed on foot with a loaded pack.
2. Permits and Paperwork
Handling the legal permits is essential to avoid blockages at the border checkpoints.
Paperwork in Chile (Copiapó)
Chile requires prior authorization issued by the Dirección Nacional de Fronteras y Límites del Estado (DIFROL). The process is completed online, free of charge, for foreign expeditions.
When entering the mountain area, you must present the approved resolution at the Carabineros checkpoint in Maricunga and notify the Nevado Tres Cruces National Park / CONAF staff of the climb. We recommend reviewing the step-by-step procedure in our DIFROL and CONAF Permits Guide for Ojos del Salado.
Paperwork in Argentina (Catamarca)
The province of Catamarca does not charge a summit fee to climb Ojos del Salado.
The bureaucratic check is done at the Gendarmería Nacional post in Las Grutas (RN 60). There you register the team members' details, the planned itinerary and the satellite communication devices (InReach or Iridium phone). It does not require prior government resolutions months in advance.
3. Infrastructure, Huts and Water Supply
Sleeping sheltered from the wind makes a substantial difference in overnight recovery at almost 6,000 meters of altitude.
Huts on the Chilean Route
The north face of Atacama has three strategic fixed structures:
- Refugio Claudio Lucero / Murray (4,340 m): Located on the shore of Laguna Verde. It works as an acclimatization point with access to natural hot springs.
- Campamento Atacama (5,200 m): Has habitable metal containers and open space to set up the domes of operating agencies.
- Refugio Tejos (5,830 m): Metal structure donated by the Universidad de Atacama. It offers basic bunks for 6 to 8 climbers, sheltering you from the extreme cold before the summit.
Total Desolation on the Argentine Route
On the Catamarca south slope there are no operational high-mountain huts along the ascent line. The whole expedition rests in four-season tents that must be secured with special sand stakes and heavy rock anchors.
As for water, in Chile you get it directly from meltwater at Campamento Atacama or by melting snow at Tejos. In Argentina you depend exclusively on melting peninsular snow slabs or on hauling water jugs by truck during the approach to El Arenal. Check the insulation you need by choosing a suitable sleeping bag with the Sleeping Bag and R-Value Calculator.
4. Physiological Acclimatization Strategies
Both sides go above the limit where atmospheric pressure delivers less than 45% of the oxygen available at sea level. Assess your saturation and hypoxia level with our Altitude to Available Oxygen Calculator.
- Copiapó route (Chile): The standard itinerary uses the Puna road hub to climb 6,000 m peaks of gradual progression such as Nevado San Francisco (6,018 m) or Cerro Vicuñas (6,067 m). Design your plan with our Acclimatization Itinerary for Ojos del Salado.
- Fiambalá route (Argentina): The strategy starts at lower altitude at the Termas de Fiambalá (1,500 m) to ascend gradually to Las Grutas (4,000 m). Practice summits are done beforehand on Falso Azufre Volcano (5,890 m) or Nevado Pissis (6,795 m). Monitor altitude sickness symptoms with the Acclimatization and Altitude (AMS) Calculator.
5. Summit Day: North Chimney vs. South Ridge
The final push to the summit presents two radically opposite technical obstacles.
The Final Chimney from Chile (North Route)
Leaving Refugio Tejos at 3:00 AM, the ascent crosses steep scree and the upper glacier or snowfield until reaching the rim of the main crater at 6,750 meters.
The decisive pitch is on the final wall at 6,870 m: a vertical rock chimney 12 meters high (II°/III° UIAA difficulty). The pitch is permanently equipped with fixed ropes. Even so, it requires progressing by pulling on a jumar or ascender while wearing thick down gloves and crampons on icy rock. We analyze this critical stretch in the guide to The Final Chimney of Ojos del Salado.
The South Slope from Argentina (Catamarca Route)
The ascent on the south side avoids the vertical north chimney. In exchange, climbers must face an endless slope of loose scree and unstable granite blocks on the southwest face.
At almost 6,800 meters, the lack of a consolidated track demands higher energy expenditure to gain each vertical meter. The summit is reached by getting onto the summit plateau from the south side, joining the upper rock tower without needing fixed-rope maneuvers on a vertical wall.
6. Which Side Should You Choose for Your Expedition?
Choosing between Copiapó and Fiambalá depends on the logistics available and your mountain philosophy.
Choose the Chilean Side (Copiapó) if:
- You want the established normal route with logistical support from local agencies.
- You prefer to approach by 4x4 up to 5,200 m to save physical energy.
- You value having fixed huts at altitude (Refugio Tejos) and comfortable acclimatization points such as Laguna Verde.
- You are comfortable doing simple rock scrambling on fixed rope.
Choose the Argentine Side (Fiambalá) if:
- You want a wild, intimate adventure expedition far from any commercial crowds.
- You master high-mountain logistics in complete self-sufficiency (setting up tent camps in extreme wind and managing your own water).
- You prefer to avoid exposed vertical rock sections at almost 6,900 meters, accepting longer days of physical scree work in return.
Review the detailed logistics and guide costs in our guide How much does it cost to climb Ojos del Salado? Real cost breakdown or compare this mountain with Aconcagua in our guide Ojos del Salado vs. Aconcagua.
