When you hike above-treeline in the White Mountains of New Hampshire, you quickly learn to look for the rock cairns that mark the trail. Blazing is scare because there are no trees to paint blazes on and they wouldn’t do anyone any good in winter because they’d be covered by ice and snow. Even if you were to paint them on rocks, they’d get worn down too quickly by the weather. The benefit of cairns is that they can withstand the punishing above-treeline weather in the Whites, they’re visible in the heavy cloud cover that shrouds the high peaks, they’re effective in all 4 seasons, and there is no shortage of good rocks to build them with!
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