
Located near the Chilean border, about 500km outside the city of Mendoza,
Las Leñas is widely considered to be Argentina's premier ski resort. Las Leñas stands out from other South American resorts because of two key factors:
1) Elevation and therefore drier snow. Las Leñas has ~4,000ft of vertical starting at a base of 7,350ft.
2) World-class out of bounds (a.k.a. off-piste) terrain that is lift accessible.
Between Las Leñas,
Valle Nevado and
Cerro Catedral, I found Las Leñas to be the most complete resort. While Catedral has more in bounds terrain as well as more lifts, the snow conditions are more variable and the terrain in geared towards beginners and intermediates. Valle Nevado is slightly higher than Las Leñas and it's a great, modern "resort" in the typical sense, but the terrain is nowhere near as unique or challenging as Las Leñas. Additionally, as I mentioned in my previous posting about Valle Nevado, you are far more likely to die on the road up to Valle Nevado than if you were to huck a 20ft cliff blindfolded. Ok, moving on...
As a resort, Las Leñas is not especially old (they were celebrating their 25th anniversary this season), but don't expect anything modern by North American or European standards. For example, there are no high-speed lifts, only one quad, and the majority of the lifts consist of 2-person chairs or t-bars. Additionally, the infamous 2-person chair named "Marte", is the only lift that gets you towards the top of the skiable terrain. When it's windy, this lift is usually closed, thereby shutting off the majority of the best sections of the resort. That said, the terrain is like nothing North America can offer, the snow is consistently good, and there are enough out of bounds skiing options to keep even the most advanced riders busy for weeks.

We came to Las Leñas in mid September, which is near the very end of their season. The upside of late August or early September is that the rates were lower and it's more likely to be sunny and warm - like spring skiing in Tahoe. The downside is that much of the snow had melted and the window for good conditions was between 10am and 3pm - in other words, after the ice and before the slush. We got lucky with 3 days of clear, sunny weather and no wind. One of my friends who has been to Las Leñas a handful of times said that the wind can be so strong that it can blow away a fresh dump of snow in just a day. It snowed ~6in two days before we arrived, which made for a great first day, but by the end of our second day, the warm afternoon temperatures turned much of the snow into peanut butter. They do a good job at grooming, so even though most of the out of bounds areas were sloppy and heavy, you could finish up your runs with some nice groomers. Vulcano, which is right below some of the gnarliest chutes and bowls has some particularly nice corduroy into late in the afternoon.

For me, the highlights of my trip to Las Leñas were Paraiso and the ultra sketchy, but thrilling chutes that drop you from Marte Iris down to Vulcano (photo of enterance above). Paraiso is a winding, fairly wide-open field that descends all the way down to the road that leads to Las Leñas. On a powder day, it would be a hundred turns of sweet, perma-grin glory to the road, but you have the option to traverse back to Vulcano or Urano and avoid the hichhike back to the base.
The photo below was the entrance for the chute run I mentioned above. First you shimmy through a throat that's about as wide as your skis, then down a very steep, rock lined chute, across a saddle to a 3rd adrenaline inducing chute and finally to two epic side-by-side bowls. This run was scary, exhilarating and exhausting - the perfect last run to finish off of my extended ski season.

Logistics: At Las Leñas, the season runs from late June to late September, with July/August being the peak.
To get to Las Leñas, you can either fly to the small town of Malargüe and take a 90min transfer, fly into Mendoza and take a 5-7hr bus ride, or take a 14-16hr overnight bus ride from Buenos Aires. We took the overnight bus from Buenos Aires, which was surprisingly comfortable, but not the best option if you only have a 7-10 days.
Like Bariloche, the accommodations in Las Lenas were far better than the lifts. Las Lenas has a
variety of great hotels and apartments, most of which are ski in, ski out.
For those of you who decide to visit, here is some helpful vocab:
pista = ski run, slope
esquiar = to ski
esquí(s) = ski(s)
tabla = snowboard
nieve = snow
hielo = ice
poma = t-bar
doblar = to turn
fuera de pista = out of bounds
silla (short for telesilla) = chairlift
bache = mogul
botas = boots
casco = helmet
bastones = poles