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Safe high altitude hiking doesn't just happen.
It's a result of planning, conditioning, staying alert, and making smart decisions.
Let's take those one at a time, so you'll have a plan for how to prepare for a high altitude hike.
Note: For the sake of discussion, let's define a high altitude hike as anything over 7500 feet.
If you're coming from sea level, though, it could be as low as 6,000 feet. Individual physiology will dictate how well (or not) you handle elevation gain within a short period of time.
And here's more bad news: Every hike at high altitude for you is different from the one before it. You can never predict exactly how your body is going to handle decreased oxygen levels.
There are only 2 kinds of hikers in the world: Those who live at high elevation already, and those who don't.
I'm in the "don't" category, so when I go on hiking trips to areas where the trail head STARTS at 7,000 feet, I know I have to be smart about high altitude hiking.
Here is the plan I recommend to hikers who live at sea level, or at considerably lower elevations than the hikes they plan to tackle:
1. Choose your hiking itinerary carefully. Be moderate with your elevation goals.
2. Divide the number of days you plan to hike into three groups: easy acclimating walks, moderate elevation gain hikes, and, if you have enough time, hikes with several thousand feet of elevation gain.
3. Be meticulous about knowing the elevation gain and loss of each hike you plan to do. And don't neglect to note the elevation at the trail head. Does it fit into your acclimation plans, or is it too aggressive?
4. Give yourself a day or two to acclimate to the trail head elevation by camping there, or staying somewhere nearby.
5. Don't deviate from your plan, just because you feel great. Things can change in a hurry (keep reading for details).
6. A rule that hikers use for sleeping at higher elevations is something along the lines of never sleeping higher than 1500 feet above where they began that morning. That doesn't mean you can't push higher once you set up base camp, just don't sleep any higher.
Respect the hard work your body is doing for you!
Whatcha gonna do if you live in Chicago, and plan to hike to the top of a 14'er? (14,000 foot mountain, such as the top of Mt. Rainier, or peaks in Colorado and New Mexico)
You're going to plan time to acclimate at the beginning of your trip, as noted above.
But what else can you do to prepare your body for the stress of decreased oxygen availability?
Here are a few ideas, none of which are medical advice:
Because you are going to stress your body in order to condition it for more harsh conditions than you normally endure, a visit to your health care provider at the beginning of the conditioning regime is a great idea.
Your goal is to strengthen your heart, making it a more efficient pump to circulate your blood. When you hike at higher altitudes, your lungs can't pull as much oxygen into your bloodstream so you need your heart to be able to distribute the less oxygenated blood efficiently.
Don't neglect the hard work of making your heart a better pump, and your lung capacity greater than it was at the beginning of your conditioning.
If you have zero experience with hiking at high elevations, you have no baseline to plan from.
Be conservative on your first high altitude hiking trip, allowing your body to give you feedback about how it feels.
Warning signs to watch for:
From my own experience, you will feel really weird, and you might have other people notice that you're acting weird, too.
At the first sign of trouble, turn around and descend slowly.
Don't talk yourself out of how you feel. Acknowledge that you're tanking, and turn around.
Although this should go without saying, I'm saying it anyway: If you have a pre-existing medical condition involving your cardiovascular and/or respiratory system, you need to condition yourself to the fullest extent possible, and get a medical ok before tackling high altitude hiking.
There are 3 ways in which your body could react to being placed at a higher elevation that it normally is.
1. Acute Mountain Sickness (AMS): Acute means it comes on quickly, and can also be resolved quickly if you descend. The warning signs mentioned above are associated with AMS.
2. High Altitude Pulmonary Edema (HAPE): The lungs fill with fluid (edema) and impair breathing to the point of coughing and chest pain. This condition can quickly deteriorate into a life threatening situation. That's why it's important to pay attention to small warning signs such as fatigue or shortness of breath that don't go away after resting or eating.
3. High Altitude Cerebral Edema (HACE): "Cerebral" means your brain has noticed that oxygen is in short supply, and the accumulating excess fluid is putting pressure on your precious soft brain tissue. Unconsciousness can occur if HACE continues to build over hours or days.
For HAPE and HACE, immediate medical attention is required.
Remove pride from your itinerary.
If you have to turn around without bagging a peak or snapping a photo from the viewpoint, so be it.
The scenery isn't going anywhere. Next time you can prepare more thoroughly or give yourself more acclimation time.
And sometimes you find out that your body just isn't cut out for high altitude hiking. I have seen prime physical specimens twenty years younger than myself succumb to acute mountain sickness.
Other times, I've been the one to say "not one more step upward".
There is no shame in turning around.
Pace yourself! If you usually hike quickly, be smart enough to adopt a slower pace.
Shortness of breath can be compensated for with a slow but steady pace and deep even breathing, to a certain extent.
Keep track of your altitude gain, either by using an altimeter or by consulting your topographical map. For every 1000 feet of elevation gain, stop and rest.
Check in with yourself before moving upward. Really listen to the little niggly doubts or hesitations.
Also note that the higher you hike, the more exposure to ultraviolet radiation you accumulate.
And if your route takes you over snow, be even more aggressive about sun protection by taking protective measures to safeguard your skin and eyes.
With every thousand feet of elevation gain, the air temperature drops by at least three degrees.
Be sure you've got enough clothing with you to avoid getting chilled and adding to your altitude issues.
There is only one way to find out: Prepare, plan, condition, and go!
Some of the happiest hours of my life have been earned by slogging uphill to high elevations, such as Camp Muir on Mount Rainier (10,000 feet/3100 meters).
And some of my most miserable, queasy hikes have been at altitudes in Yellowstone that don't even come close to Camp Muir.
You just never know!
But now you know how to be smart about high altitude hiking.
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