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WEATHER
Subalpine-Alpine Zone
Ecoregion
on
Columbia Plateau
in
OR
,
WA
,
ID
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The Subalpine-Alpine Zone includes the highest areas of the Elkhorn, Wallowa, and Strawberry mountains or Oregon, the Seven Devils Mountains of Idaho, and a small sliver in the Blue Mountains of Washington, beginning near tree line at an elevation of 6,500 feet, where the forest cover becomes broken by alpine meadows, and continuing through alpine meadowland to include the exposed rock, snowfields, and glacial ice of the highest mountain peaks. These areas characteristically have cold soil, deep snowpack, and a very short growing season. Forest species adapted to such conditions are subalpine fir, Engelmann spruce and whitebark pine. Historically, green fescue and sedges covered the high alpine meadows, but, following intense grazing pressure by sheep early in the 20th Century, many high elevation plant associations reverted to seral or exotic species.
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Ecoregion
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