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Foothill Grassland

Ecoregion in MT

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The Non-calcareous Foothill Grassland ecoregion lies east of the Continental Divide where it slopes down from the lower mountain treeline to the plains. Its hills and scattered buttes are dissected by shrub- and tree-covered, mountain-fed streams. Ecoregion 42r is physiographically different from the mountains of Ecoregions 17 and 41, the plains of ecoregions 42 and 43, and the Rocky Mountain Front Foothill Potholes (42q). Potential natural vegetation is mostly foothills prairie. A variety of mostly non-carbonate rocks underlie Ecoregion 42r; lithology, stream quality, and aquatic biota are different than in the Limy Foothill Grassland (43u). Ecoregion 42r typically receives more precipitation than the plains below and less than the mountains above. It can be affected by chinooks. Ranching is common. Ecoregion 42r extends into Canada.

— EPA

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