Cerro Las Campanas: Driving to the giant telescopes of the Atacama
Located in the heart of the Atacama Desert in northern Chile, Cerro Las Campanas is a high mountain peak reaching an elevation of 2,380m (7,810ft) above sea level. This summit is world-renowned for hosting the Las Campanas Observatory, a premier astronomical site where the combination of extreme aridity and high altitude provides some of the clearest skies on Earth for deep-space observation.
| Road facts: Cerro Las Campanas | |
|---|---|
| Location | Atacama Desert, Northern Chile |
| Elevation | 2,380 m (7,810 ft) |
| Length | 39.6 km (24.6 miles) |
| Elevation Gain | 1,325 m |
| Average Gradient | 3.34% |
Where is the road to Cerro Las Campanas?
The journey to the summit starts from the paved Ruta 5 (Pan-American Highway), roughly between the cities of Vallenar and La Serena. From the turn-off, the road spans 39.6 km (24.6 miles) as it winds deep into the barren mountain ranges of the Atacama. While the observatory at the top is a high-tech hub with telephones, internet, and first aid, the road to get there is a lonely traverse through the driest desert on the planet, where you'll see more telescopes than people.
Is the road to Cerro Las Campanas paved?
The road to the summit is a mix of paved and unpaved sections. While the main access is maintained to allow heavy astronomical equipment to reach the top, the surface can be unpredictable. The climb is pretty steep in several stretches, overcoming an elevation gain of 1,325 meters. Drivers should expect a well-graded but dusty gravel surface on the unpaved parts. The real challenge isn't just the terrain, but the heavy mist (camanchaca) that often rolls in from the Pacific, creating low visibility conditions that can make the steep drops along the road extremely dangerous.
What is the weather like at Cerro Las Campanas?
Don't let the desert location fool you; at 2,380 meters, the weather is harsh and unpredictable. High winds blow across the ridges all year long, and temperatures in the winter are brutally cold. Even in the middle of summer, sudden storms can bring unexpected snow to the peak. With such a high summit altitude, the road can be closed at any time due to snowfalls or risk of ice. If there is snow on the ground or a storm is brewing, it is vital to avoid driving as much as possible, as the combination of steep gradients and slick surfaces is a recipe for disaster in such a remote area.
What will you find at the summit of Cerro Las Campanas?
Reaching the summit brings you to one of the most important scientific outposts in the Southern Hemisphere. The site features five optical telescopes and one solar telescope, including the famous Magellan telescopes. Because it is a working scientific station, the area is equipped with basic services like running water and bathrooms for staff, but visitors should remain alert to traffic. Large service vehicles often share the narrow mountain road, and the silence of the desert means you often won't hear them coming until they are around the next bend. Always pick your lines carefully and use low gears on the descent to manage the 3.34% average gradient without cooking your brakes.
Pic: Ida Leter