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Hiking in the Clouds: What Happens at Altitude


We get a lot of questions about altitude here at OneSeed. We do play in the mountains a lot after all!

Altitude can effect people differently, but some we’ll cover some of the details here:

  • What altitudes each trip reaches
  • How altitude sickness can effect you
  • How to prevent altitude sickness and monitor for it
  • The signs of altitude sickness
  • How OneSeed handles altitude sickness preparation before hitting the trail
  • What happens on the trail if you are hit with a bout of altitude sickness.

Altitude sickness, also known as acute mountain sickness (AMS), can be very serious, but we build in rest days on our trips to allow trekkers to acclimate to the elevation. You can learn more about AMS here.

While you may not get altitude sickness, your tummy may be affected by the altitude and act up a bit, so if you’re feeling a bit gassy, it’s only the alti-tooties. Just call fair warning to those hiking behind you!


To give you an idea of how high you will be climbing, view the elevation chart below:

Trip Name City/Town Name Elevation (Meter) Elevation (Feet)
Kathmandu, Nepal 1,402 4,600
Denver, Colorado, USA 1,609 5,280
Santiago, Chile 518 1,700
Empire State Building, New York City, USA 443 1,454
Chile: Trek & Sip optional day trek 1,600 5,249
Denver, Colorado, USA 1,609 5,280
Chile: Epic Patagonia Torres del Paine 1,100 3,608
Tuscon, Arizona, USA 899 2,950
Nepal: Annapurna Ascent Annapurna Base Camp 4,130 13,459
Climb to the top of the Empire States Building (1,454ft) 9 Times 3,987 13,086
Nepal: Annapurna Discovery Deurali 2,800 9,186
The length of the Golden Gate Bridge 2,743 9,000
Nepal: Everest Base Camp Everest Base Camp 5,200 17,060
A 5K race is 3.2mi or about 17,000 5,181 17,000
Nepal: Khumbu Pilgrimage Pangboche 3,930 12,893
A typical height for skydiving 3,962 13,000
Nepal: Langtang Journey Kyanjin Gumpa 3,730 12,237
About 4.5 times higher than the world’s tallest building, Burj Khalifa (2,722ft) 3,733 12,249

Altitude sickness is caused by the “thinner” air at elevation, so you have difficulty getting enough oxygen. For a scientific explanation of what happens at altitude,visit here.

Symptoms can include headaches, loss of appetite, nausea, irritability, loss of coordination, dizziness, feeling weak, and trouble sleeping.

Before leaving for a trek, OneSeed staff will educate trekkers on altitude sickness and the signs and symptoms before hitting the trail. While on the trail, we have built in rest days to allow trekkers time to acclimate before hiking to higher altitudes. If anyone experiences symptoms of altitude sickness, OneSeed guides will stay with guests and escort them to lower elevations until they are feeling better and can rejoin the group.

Annapurna Ascent

When hiking at high altitudes, make sure to drink lots of water, even if you aren’t thirsty. Staying hydrated can help reduce the effects of altitude sickness. Make sure to eat well rounded meals. Wearing a hat, sunscreen, sunglasses and layers are important as you are more exposed to the elements and the weather can change quickly. Trekking at a slow and steady pace and taking frequent breaks will help ensure you reach your goal!

For more information, visit the CDC website here.