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Big Hole

Ecoregion in Rocky Mountains, MT

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The cold, subirrigated Big Hole ecoregion is a low-relief, high elevation valley containing meadows, extensive wetlands, floodplains, swampy creeks, many springs, broad stream terraces, and alluvial fans. The growing season averages about 30 days, which is much shorter than those of the neighboring Deer Lodge-Philipsburg-Avon Grassy Intermontane Hills and Valleys (17ak) or the Dry Intermontane Sagebrush Valleys (17aa). The potential natural vegetation is mapped as mostly sagebrush steppe. Gravel quarries occur, ranches are common, and much of the valley is ditched.

— EPA

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