How much warmer clothes do I need compared to sea level hiking?

Temperature drops 2°C for every 300 meters of elevation gain. At 4,000 meters, expect temperatures 25-30°C colder than sea level. Pack for conditions 20°C below what weather forecasts show for the base.

Should I buy or rent high-altitude gear?

Rent sleeping bags, mountaineering boots, and technical gear for one-off trips. Buy base layers, trekking boots, and down jackets if you'll trek regularly. Renting costs $30-50 per item but ensures proper gear without storage issues.

How do I prevent my water from freezing?

Use insulated bottles, keep them close to your body, or add a pinch of salt to lower freezing point. Hydration tube systems freeze quickly—stick to bottles above 3,500 meters. Bring at least 3-4 liters capacity total.

What's different about packing for technical vs. trekking peaks?

Technical climbs need mountaineering boots, crampons, ice axes, helmets, and climbing harnesses. Trekking peaks like Kilimanjaro or Everest Base Camp only need hiking boots and warm layers. Check route requirements—some 'treks' have technical sections.

How to Pack for High Altitude Mountain Treks

Pack in layers with moisture-wicking base layers, insulating mid-layers, and waterproof outer shells. Bring altitude sickness medication, high-SPF sunscreen, and quality trekking boots broken in beforehand. Weight matters—aim for 15-20% of your body weight maximum.

Start with the layering system. Pack 2-3 moisture-wicking base layers (merino wool or synthetic), 1-2 insulating layers (down or synthetic jackets), and 1 waterproof shell jacket. Avoid cotton entirely—it kills in cold, wet conditions.
Choose altitude-specific gear. Bring acetazolamide (Diamox) if prescribed by your doctor, SPF 50+ sunscreen and lip balm, glacier glasses or high-UV sunglasses, and a warm hat that covers your ears. The sun reflects off snow and thin air provides no UV protection.
Select proper footwear. Wear broken-in trekking boots with ankle support. Pack 2-3 pairs of merino wool hiking socks and 1 pair of liner socks to prevent blisters. Gaiters keep snow out of boots above 3,000 meters.
Pack emergency and safety items. Include a headlamp with extra batteries, emergency whistle, basic first aid kit with blister treatment, and emergency shelter or space blanket. Weather changes fast at altitude.
Organize by weight priority. Keep your pack under 15-20% of body weight. Use packing cubes to compress clothes. Put heavy items close to your back and centered. Leave non-essentials at base camp or with porters if available.

How much warmer clothes do I need compared to sea level hiking?: Temperature drops 2°C for every 300 meters of elevation gain. At 4,000 meters, expect temperatures 25-30°C colder than sea level. Pack for conditions 20°C below what weather forecasts show for the base.
Should I buy or rent high-altitude gear?: Rent sleeping bags, mountaineering boots, and technical gear for one-off trips. Buy base layers, trekking boots, and down jackets if you'll trek regularly. Renting costs $30-50 per item but ensures proper gear without storage issues.
How do I prevent my water from freezing?: Use insulated bottles, keep them close to your body, or add a pinch of salt to lower freezing point. Hydration tube systems freeze quickly—stick to bottles above 3,500 meters. Bring at least 3-4 liters capacity total.
What's different about packing for technical vs. trekking peaks?: Technical climbs need mountaineering boots, crampons, ice axes, helmets, and climbing harnesses. Trekking peaks like Kilimanjaro or Everest Base Camp only need hiking boots and warm layers. Check route requirements—some 'treks' have technical sections.