Patagonia's wind is not weather. It is a permanent condition of the landscape, and the landscape has adapted to it: the lenga trees on the steppe grow horizontally, the grass lies flat in one direction, and the guanacos position themselves in the lee of whatever is available.
Understanding that changes what you pack. Gear that performs adequately in the Alps or the Rockies fails here in specific, predictable ways, and almost all of the failures come down to the same thing — the wind finds the loose part and works on it until something gives.
Why it blows like this
Worth a paragraph, because it explains why the wind does not stop.
Between roughly forty and sixty degrees south there is almost no land to slow the westerly circulation. The wind runs unimpeded around the planet, hits the Andes, and accelerates over and around them. Southern Patagonia sits directly in the funnel. There is no diurnal pattern to wait out and no sheltered season to plan around, only degrees of the same thing.
It peaks in the austral summer, from December to February, which is also when most people go. November and March are noticeably calmer, which is one of several arguments for the shoulder months.
The shell is the whole system
A hardshell here needs three things that ordinary jackets lack.
A hood that cinches down and stays on. Not a hood with a drawcord at the back — a hood with volume adjustment and a wired or stiffened brim that holds its shape against a crosswind. A hood that blows off is a hood that does not exist, and putting it back up every ninety seconds for eight hours is genuinely demoralising.
Wrist closures that seal. Velcro tabs that actually tighten, not elasticated cuffs. Wind driving up a sleeve strips heat faster than anything else.
A hem drawcord. A jacket that lifts and flaps is losing warmth and destroying its own seams.
Fabric matters less than fit and closures. A mid-range three-layer shell with good adjustment outperforms an expensive one that flaps.
Softshells are not a substitute in sustained rain, and rain here arrives horizontally. Ponchos are actively dangerous — in a gust a poncho becomes a sail attached to your neck.
Layers underneath
The temperature is rarely extreme. Summer days on the trail are usually somewhere in the single digits to mid teens Celsius. The problem is the wind chill on top of it, and the fact that you will alternate between sheltered forest where you overheat and exposed shoulders where you do not.
A thin merino base layer, a light fleece or grid fleece as the working mid layer, and a compressible insulated jacket to put on the moment you stop — that is the whole system. The insulated jacket is for standing still: at viewpoints, at rest stops, and in camp. Synthetic insulation is the safer choice over down here, because it keeps working when damp and everything here eventually gets damp.
Waterproof trousers are not optional. Carry them accessible, not at the bottom of the pack.
Tents
If you are camping, a freestanding geodesic or a well-guyed tunnel tent rated for four seasons is the only sensible choice. A lightweight three-season tent designed for summer in temperate mountains will not survive a bad night.
Pitch tail into the wind, use every guy line the tent came with, and weight the pegs with rocks — the ground at many Patagonian campsites is loose and pegs pull out under sustained load rather than in a single gust.
Many campsites in Torres del Paine now offer pre-pitched tents specifically because visitor tents fail so regularly, and taking one is not a defeat. It is often the better decision.
Poles, and why you need them
Trekking poles here are a balance system rather than a knee aid. On exposed sections — a moraine crest, a ridge, an open river flat — planting two poles is what keeps you walking in a straight line instead of being pushed sideways off the trail.
Use the wrist straps properly: hand up through the loop from below, then down onto the grip, so the strap takes the load rather than your fingers. Adjustable poles with a reliable lock are worth more than light ones with a lock that slips.
Sun, which nobody packs for
The ozone layer over southern Patagonia is measurably thinner than at comparable northern latitudes, and burn times are short even under cloud. This surprises people who have arrived dressed for cold.
High-factor sunscreen applied to the face, ears and the back of the neck. Proper sunglasses, ideally wraparound, because grit is airborne constantly. A brimmed hat with a chin cord — without one it is gone within a day, and you will watch it go. Lip protection with an SPF is the item people forget and then think about hourly.
The small things that fail
A short list of what actually breaks, drawn from the pattern of what people replace in Puerto Natales and El Calafate.
- Cheap pack rain covers. Torn off within a day. Use one if you like, but line the inside of the pack with a dry bag as well.
- Wide-brimmed hats without a cord. Gone.
- Contact lenses in wind-blown grit. Bring glasses as a backup even if you never normally wear them.
- Phone and camera batteries in the cold. Carry them inside a layer, not in a pack lid.
- Umbrellas. Do not.
- Zip-off trouser legs. The zips fill with grit and stop working.
What you do not need
There is a tendency to over-prepare for Patagonia because of its reputation, and the result is a pack that is too heavy for a trek where distance rather than technicality is the difficulty.
You do not need mountaineering boots, crampons, an ice axe, a four-season sleeping bag if you are staying in refugios, or a water filter for most of Torres del Paine, where the streams are drinkable in the majority of sections. You do not need three changes of clothes. You do not need a heavy tripod, which in this wind is an unstable lever rather than a stabiliser.
The single best weight saving available is booking refugios with meals, which removes food, stove and fuel in one decision.
Where to buy what you forgot
Puerto Natales and El Calafate both have outdoor shops and rental outfits aimed squarely at people who have just realised something. Rental is available for tents, sleeping bags, mats, poles and packs, and it is generally cheaper than shipping gear you will use once.
Prices for technical clothing in Chile and Argentina are considerably higher than in Europe or North America, so buy the shell before you travel and rent the bulky items on arrival.
For the trek this equipment is mostly for, see the W Trek planning guide. For the Argentine side of the massif, where the walking is day hikes and the wind is identical, El Chaltén's four day hikes.
