The trail to the summit is easy to discern. It does split in a few places, but as long as one keeps heading towards the summit, it is difficult to become lost.¹ An elevation profile derived from my GPS track is below. It is approximately 1.7 km to the summit, with around 360 m of vertical gain (average grade of 22%). Round-trip, the climb took a little over two hours.

From the summit, one has an excellent view of Licancabur, Juriques, and Boliva to the north; Argentina to the east; and ALMA to the southwest.

1. There’s no vegetation to obstruct one’s view.  ↩

After recording a GPS track during the climb, I added the track and trail to OpenStreetMap, so it should be easier for others to find in the future. An annotated map is below, and a KML file of the track and trail can be downloaded. To get to the trailhead, one leaves San Pedro de Atacama driving south on CH 23. Although the trip starts on paved highways, a four-wheel drive vehicle is a must for its latter parts. After passing through Toconao, one drives another 10 km south before taking a left and heading east towards Talabre on B-357. After passing Talabre, the road turns to gravel and after around 10 km descends into a valley, where the road comes to a fork. Take the right fork, fording a small stream and heading south, climbing back out of the valley.² After continuing on this road for around 26 km, Laguna Lejía should come into view, after which one needs to take a left onto a dirt track and head north towards Lascar. The track is not always very well defined, but it wasn’t too difficult to follow.³ Lascar is in view at this point, so one essentially just needs to drive towards the smoldering volcano. The “parking” area for the trail is after about 14 km; it’s an unmarked area on the slope where the track turns into a trail that is essentially as far up as one can drive before the grade becomes too steep for a vehicle. It is important to note that as one gets close to the trailhead, the ground becomes covered with a layer of loose aggregate, which is easy to become stuck in if one drives off the track.⁴ The ~110 km drive from San Pedro de Atacama took around two and a half hours.

Here, at around 4930 m, the climb begins. Although it should go without saying, climbing an active volcano, and climbing at altitude in general, can be dangerous, and you should do so at your own risk; in particular, one should check for recent volcanic activity. There is an easily discernible trail the entire way up, although in sections it splits into switchbacks for the way up and a straight route for the way down. Much of the trail surface is composed of loose volcanic soil, which making hiking a bit more difficult; the climb is decently steep, averaging 24% grade. Also, due to the altitude, there is around half the oxygen there is at sea level. A winter coat and boots were a necessity. An elevation profile derived from my GPS track is below. It is around 2.3 km to the crater rim with ~560 m of vertical gain; it is then another ~0.6 km to the summit with ~110 m of vertical gain. It took my climbing partners and I around three hours to ascend and one hour to descend; we also spent around half an hour at the top, split between the summit and crater rim, to take in the view and have lunch. We were fairly well acclimatized, having spent the previous two weeks staying in San Pedro de Atacama at ~2400 m and working almost every day at ~5200 m, although none of us climb mountains on any sort of regular basis. I started the hike with just under 5 L of water and drank around two-thirds of it before returning to the truck. Between the vertical gain and lack of oxygen, I certainly felt the weight of the water (and an emergency oxygen bottle).

Looking down into the crater, one sees plumes of volcanic gases, a testament to Lascar being an active volcano. Fortunately, the gases were not being blown towards the trail on the day I climbed, although one could certainly still smell the sulfur. The view from the summit is breathtaking; the barren volcanic landscape barely seems terrestrial. One can see dozens of other volcanoes in all directions. The summit is marked by a stone cairn (and volcanic monitoring equipment). It is also extremely windy at both the crater rim and the summit, to the extent that it was difficult to stand upright. Fortunately, rock wind shelters have been built at both locations, which provide respite; at the summit one can sit and rest in the lee of the shelter while taking in the view to the south. On the climb up, my climbing partners and I passed two groups of climbers on their way down—both groups appeared to be guide-led; on the way down, we passed a pair of Chileans on their way up. Once we got back to our truck, we ran into a group of volcanologists who were there to collect gas samples from within the crater; Lascar was just one stop on their expedition to many volcanoes in the area. Not only were they climbing the volcano, but they were going to carry lots of equipment with them and climb down into the crater. Although we did see other people while hiking, we didn’t pass a single vehicle between leaving and returning to the main highway, CH 23, west of Talabre while driving (it was a Sunday).

Either on the way to or from the volcano, one should also definitely stop at Laguna Lejía, the salt lake at the turn off from the road.

More photos are in an album on Flickr.

1. The parking area was shown in an incorrect location.  ↩

2. This is the continuation of B-357, although it’s not marked.  ↩

3. If there’s snow on the ground, it’s probably an entirely different story. ↩

4. I couldn’t possibly be speaking from first-hand experience.  ↩