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Fascinating how those trees manage to survive there. I'm assuming a short but warm growth season?
What these trees go through is amazing. Especially higher up and on ridges, where they get wind-blasted and encased in snow.
Winter at these elevations lasts from about October through April, with the snowpack often over 6 meters deep. It's weird walking along and coming across a small branch of fir poking up, and realizing it's just the tip of the iceberg and there's a whole tree beneath you. They're incredibly resilient to the harsh winter, and it's a short summer growing season, indeed. The snow melts out the most from July through August, so it's only a few months to work with. On the upside, the days are long and generally clear and warm, so they can make the most of them.