How cold does it get at high altitude?

Temperature drops roughly 3.5°F per 1,000 feet of elevation gain. At 10,000 feet, expect temperatures 35°F colder than sea level. Night temperatures can be 40-50°F lower than daytime highs.

Can I rent high-altitude gear instead of buying?

Many outdoor gear shops in high-altitude destinations rent equipment. In Nepal, rent quality down jackets for $1-2 per day. In Colorado, expect $15-25 per day for full winter gear packages.

What's different about sun protection at altitude?

UV radiation increases 10-12% every 3,000 feet. Snow reflects 85% of UV rays back at you. Regular sunglasses aren't enough—you need glacier glasses with side protection and 99% UV blocking.

How do I know if my gear is warm enough?

Check temperature ratings on insulation. Down jackets show comfort ratings—a jacket rated to 20°F keeps you comfortable to that temperature. For sleeping systems, add 10-15°F buffer above the rated temperature.

How to dress for high altitude destinations

Layer merino wool base layers, insulating mid-layers, and waterproof outer shells. UV protection becomes critical above 8,000 feet where sun intensity increases 10-12% per 3,000 feet of elevation. Pack for temperature swings of 40-50°F between day and night.

Start with moisture-wicking base layers. Choose merino wool or synthetic materials that pull sweat away from skin. Cotton kills at altitude—it holds moisture and loses insulation when wet. Pack 2-3 base layer tops and bottoms for trips over 4 days.
Add insulating mid-layers. Fleece, down, or synthetic insulation for warmth. Down works best in dry conditions, synthetic insulation performs better when wet. A 200-weight fleece covers most conditions between 6,000-12,000 feet.
Pack a windproof and waterproof outer shell. Weather changes fast at altitude. Your shell should have full zips for ventilation and pit zips for temperature regulation. Look for 3-layer Gore-Tex or similar breathable waterproof fabric.
Protect your extremities. Pack liner gloves plus insulated gloves, a warm hat that covers ears, and wool socks with liner socks to prevent blisters. Your body prioritizes core warmth—fingers and toes get cold first at altitude.
Choose proper footwear. Waterproof hiking boots with ankle support. Break them in before your trip—blisters are dangerous when you're far from help. Gaiters keep snow and debris out of boots.
Layer for sun protection. UV radiation increases significantly with elevation. Pack a wide-brimmed hat, glacier glasses (not regular sunglasses), and SPF 30+ sunscreen. Reapply sunscreen every 2 hours, including lips and inside nostrils.

How cold does it get at high altitude?: Temperature drops roughly 3.5°F per 1,000 feet of elevation gain. At 10,000 feet, expect temperatures 35°F colder than sea level. Night temperatures can be 40-50°F lower than daytime highs.
Can I rent high-altitude gear instead of buying?: Many outdoor gear shops in high-altitude destinations rent equipment. In Nepal, rent quality down jackets for $1-2 per day. In Colorado, expect $15-25 per day for full winter gear packages.
What's different about sun protection at altitude?: UV radiation increases 10-12% every 3,000 feet. Snow reflects 85% of UV rays back at you. Regular sunglasses aren't enough—you need glacier glasses with side protection and 99% UV blocking.
How do I know if my gear is warm enough?: Check temperature ratings on insulation. Down jackets show comfort ratings—a jacket rated to 20°F keeps you comfortable to that temperature. For sleeping systems, add 10-15°F buffer above the rated temperature.