Before we dive into anything else, I would like to emphasize that the most important thing about hiking during the summer is staying properly hydrated. Hiking in hot, dry weather depletes your body of liquids. To replace lost fluids and electrolytes you need to drink frequently. If you wait until you feel thirsty, you’ll more than likely already be dehydrated. The more dehydrated you become, the less efficient your body is at cooling itself down, thus making your body become less efficient at walking.
Make sure you take plenty of water or some type of sports drink with you on any hike. Sports drinks are excellent sources of liquids because they replace both fluids and electrolytes. Good old Gatorade gets the job done for me.
You can sweat anywhere from 1/2 to 1 quart of fluid for every hour you walk in the heat. This fluid/electrolyte loss can exceed 3 quarts per hour if you hike uphill in direct sunlight and during the hottest time of the day.
When it's really hot, my wife and I will fill a couple of water bottles about half-way and stick them in the freezer the night before. Then, just before leaving for our hike the next day, we'll top-off the bottles with cold water. This way we'll have cool water to drink for a much longer time on the trail. Please note that you don't want to put a full bottle of water in the freezer as it will crack the plastic.
If you’re thinking about drinking water from the backcountry, know that it must be treated for Giardia lamblia, a parasite that can cause an intestinal infection with a variety of symptoms. To avoid this infection, boil water for at least one minute or use a filter capable of removing particles as small as 1 micron.
To help offset the effects of fatigue, bring a lunch and/or snack with you. Food is your body's primary source for fuel and salts (electrolytes) while hiking. Try eating a salty snack every time you take a drink.
Finally, stay away from sodas and alcohol as they will only promote dehydration.
Besides staying properly hydrated, there are a few other things you can do to help avoid over-heating while out on the trail.
For one, go slowly and rest often. Also, try hiking in the early morning as this is coolest part of the day.
Summer also provides a great opportunity to explore trails at the higher elevations in the park where it’s naturally cooler. Keep in mind, however, that the summer season usually brings thunderstorms to the Rocky Mountains. Never ascend above tree line when there’s lightning in the vicinity. If you’re already above tree line when a thunderstorm approaches you’ll want to descend immediately.
Wear moisture-wicking clothing made of polypropylene or polyester to carry sweat and moisture away from your body. Moisture-wicking material keeps you dryer, cooler and more comfortable than a sweat-soaked cotton shirt. It’s also a good idea to wear light colored clothing because it tends to reflect heat away from your body.
Wearing a hat - a baseball hat, or, preferably, a wide-brimmed hat - will help protect your face and neck from the sun. Don’t forget sunscreen either. Sun-burned skin makes you feel hotter.
Finally, you should be aware of heat related health issues on the trail. As part of your first aid training you should know the signs for heat exhaustion, heatstroke and even hyponatremia; and know what to do if someone in your party has any of these signs.
* For additional safety tips, please click here.
* To make sure you have all the essentials before heading out on the trail, please review our hiking checklist.
Jeff
RockyMountainHikingTrails.com
HikinginGlacier.com
TetonHikingTrails.com
Ramble On (2nd edition book on the rich history of hiking)
Exploring Glacier National Park
Exploring Grand Teton National Park
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