Can I just buy warm clothes when I get there?

Yes, but high-quality technical gear is often more expensive or harder to find in mountain towns. Buy your core items before you leave.

How do I deal with dirty laundry?

Pack a dry bag or a dedicated laundry compression cube. Use laundromats in major hubs like Lima, Cusco, or Buenos Aires; it's cheap and reliable.

How to Pack for Multiple Climate Zones in South America

Use a layering system consisting of a moisture-wicking base, a thermal mid-layer, and a high-quality windproof/waterproof shell. Pack your clothes in compression cubes to manage volume and focus on versatile fabrics like merino wool that don't require frequent washing.

Choose your core layers. Start with a base layer (synthetic or merino), a fleece or down vest mid-layer, and a lightweight, packable rain shell. This combination covers you for a humid day in the Amazon and a freezing morning in the Andes.
Use the 'Rule of Three' for footwear. Bring one pair of broken-in waterproof hiking boots, one pair of versatile walking sneakers, and one pair of lightweight sandals. Wear the heaviest pair (boots) on the plane to save luggage weight.
Implement compression packing. Use compression packing cubes to reduce the volume of your heavy items. Put your bulky down jacket in a small compression sack to shrink it to the size of a water bottle.
Prioritize fabrics over quantity. Only pack items made of merino wool or high-tech synthetics. These fabrics are odor-resistant and quick-drying, meaning you can get away with packing for 7 days even on a 3-week trip.

Can I just buy warm clothes when I get there?: Yes, but high-quality technical gear is often more expensive or harder to find in mountain towns. Buy your core items before you leave.
How do I deal with dirty laundry?: Pack a dry bag or a dedicated laundry compression cube. Use laundromats in major hubs like Lima, Cusco, or Buenos Aires; it's cheap and reliable.