Heat Safety in the High Sierra

Alex Wierbinski's picture

By Alex Wierbinski - Posted on 16 March 2012

A lot of people may think it strange to speak of heat safety in the Sierra Nevada Mountains. But it is not. This harsh environment of extremes often serves up high temperatures.

I have experienced low to high 80 degree tempertures hiking South on the Tahoe to Yosemite Trail  from Round Top near Carson Pass all the way down to Jenkins Canyon during countless trips between mid-July to mid-August. Even some low 90 degree tempertures. Once you get some altitude approaching Highland Lakes things finally begin to cool off, but not the danger. Higher altitudes, though cooler, still carry the risk of exposure due to the intensity of light rather than the heat.

These high tempertures are mostly a function of elevation. The Tahoe to Yosemite Trail traces a low elevation route along sections of its Western Flank route.

Check out the low elevations along parts of the trail between Carson Pass to Lake Alpine, and Lake Alpine to Saint Marys Pass. Those low elevations are potential hot spots along your hike, depending on conditions. Heat waves during early Summer are not uncommon.

Take heat seriously. It poses a significant danger while hiking at altitude carrying loads that are already stressing out your metablolism. Maintaining hydration and not overheating must happen, and you must have a better system than how "you feel." The "feel" system fails..

I maintain hydration based on logical standards proven by experience and monitored for accuracy by the frequency and color of my pee. I pack 32 oz of water for a max of 9 miles of "regular" high altitude travel, and lower the mileage down to 7 miles for "warm" tempertures, and down to 5 miles for "hot" conditions.

My standard rewatering practice is to drink 32 ounces each time I refill my 32 ounce bottle. I drink more if conditions are warm, and even more for hot tempertures. The factor I find important for my rewatering practices is time.

When I am really hot it takes a few minutes for me to cool down sufficiently to take in the amount of water I need. It appears that overheated hikers tend to underestimate the water they actually need by not taking the time their bodies require to absorb that much water.

Clear water must go in and out on a regular basis or you will "feel" like crap if not crash hard. Another good marker of your level of hydration is the mositure level of your crap. If your turds look as dry as coyote turds you are seriously dehydrated, and you must significantly increase your water intake.

The National Weather Service has a great page about the Heat Index and simply describes the physical and atmospheric physics behind the Heat Index.

 National Weather Service Heat Safety Index for Backpackers.



All Mountain Safety Topics

All Mountain Safety News


Current High Sierra Hazards


Powered by Drupal, an open source content management system

Text Translations

Flag icon for 'de' languageFlag icon for 'it' languageFlag icon for 'ru' languageFlag icon for 'fr' languageFlag icon for 'es' languageFlag icon for 'pl' languageFlag icon for 'no' languageFlag icon for 'fi' languageFlag icon for 'da' languageFlag icon for 'ro' language

Get the Latest from Tahoe to Whitney

Syndicate content

Support Tahoe to Whitney

The Tahoe to Whitney Trail Guide and Magazine are walked, written, funded, and supported by my efforts, with the help of kindred spirits and my sister.

We offer valuable Trail Guide, Skills, Weather, News and Analysis.

My goal is to get you out to see your natural and social potential. Help me keep this unique resource accessible and expanding towards its potential. We've a lot of miles to cover ahead...

If you feel these efforts are valuable, I'm cordially inviting you to support them, here:



I am currently working towards publishing the completed guide between Tahoe & Yosemite as an e-book, while converting this "blog" to a fine magazine format. You will like the results! Help Tahoe to Whitney reach its potential!


Why Support Tahoe to Whitney?
Mission Statement