Lascar is the most active volcano in northern Chile, a broad, ash-grey cone of about 5,600 m on the edge of the Salar de Atacama that has produced plumes of steam and ash for as long as people have watched it. It rises south-east of San Pedro de Atacama, and on clear days a thin white plume can be seen from the village. A guided hike on its flank is a serious outing for strong, acclimatised walkers, offering a close look at a living volcano, the colours of its crater rim and a view across the salt flats and neighbouring peaks that few visitors ever see. The route follows a steep path of loose ash and gravel, with a long, slow ascent and a quicker descent, and the group stops often to rest and adjust to the thin air. Guides decide how far to go depending on volcanic activity, weather and the condition of the group, and the route can change at short notice. Where access to the crater rim is permitted, the view into the crater, with its fumaroles and mineral colours, is the highlight. Where it is not, the climb still offers sweeping views over the altiplano, and a satisfying sense of having climbed a real volcano.
How it works
Tours run in the morning, with pickup before sunrise and a drive of about two hours to the trailhead. The ascent takes several hours, and the group returns to San Pedro in the late afternoon. Because Lascar is active, access can be restricted, so operators monitor conditions and can change or cancel an outing if needed. Always book through a licensed operator with experienced mountain guides.
What to expect
This is one of the more demanding excursions near San Pedro, and it is best done after several days of acclimatisation. You should be in good health, comfortable walking uphill for hours, and prepared for cold, wind and strong sun. Wear layers, windproof outer clothing, good boots, hat, gloves and sunglasses. Bring plenty of water and snacks. Altitude sickness is a real possibility, and guides will tell you to stop or turn back if symptoms appear. People with heart or lung conditions should seek medical advice first.
Making the most of it
Schedule Lascar after several lower-altitude outings, and follow your guide's pace, which will feel almost absurdly slow but conserves energy. Bring a camera with a charged battery, and keep it warm. If you only want one volcano on your trip, compare Cerro Toco, which is a straightforward summit walk, with Lascar, which adds the drama of an active volcano but also the uncertainty of conditions. In either case, flexible plans and a margin for weather will serve you well.
What to expect
The experience
A demanding guided hike on an active volcano, with views over the altiplano and, where permitted, into the crater.
Best time
Morning, with an early start for the most stable weather.
How long
Eight to ten hours including the drive.
Tips
Acclimatise first, use a licensed operator, dress for cold and expect plans to change with conditions.
Quick picks
- Best for
- Fit hikers who want a serious outing and are well acclimatised.
- Families
- Not suitable for young children because of altitude, cold and the length of the day.
- Couples
- A shared challenge and a memorable view, for couples who enjoy mountains.
- Pair with
- Pair it with a restful spa day afterwards.
- Time needed
- Allow a full day.
Good questions
Is Lascar safe to climb?+
Lascar is active, so access depends on conditions. Reputable operators monitor activity and will change or cancel the plan if needed.
How high is Lascar?+
The summit is at about 5,600 m above sea level.
Do I need previous mountain experience?+
Not technical experience, but you need to be fit, healthy and acclimatised, and to walk slowly for several hours.
Can I see into the crater?+
Only where access is permitted on the day. Your guide will explain what is possible.
When should I do it during my trip?+
After at least two or three days in the region, once you have adjusted to the altitude.