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Flathead Hills and Mountains

Ecoregion in Flathead Reservation, Rocky Mountains in MT

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The semiarid to subhumid Flathead Hills and Mountains ecoregion is underlain by Precambrian argillite, argillaceous rocks, and quartzites. It is in the rainshadow of the Salish Mountains. Average annual precipitation ranges from 16 to just over 25 inches and is less than that received by the higher Grave Creek Range-Nine Mile Divide (15a) and Salish Mountains (15l) to the west. Climax vegetation is mapped as subalpine fir, Douglas-fir, grand fir, and ponderosa pine forests and the tree cover is commonly sparser than in wetter ecoregions.

— EPA

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