In the United States, the current distribution of big sagebrush ranges from Washington and California east to the Dakotas and Nebraska. In the future, areas where sagebrush will expand, the leading edge, are predicted to be on the northern edge of its current range—predominately northeast Montana. Conversely, areas where the current sagebrush distribution is predicted to contract, the trailing edge, reside at the southern edge of the current distribution, including the Great Basin. Both of these projected shifts are most likely in response to predicted increased minimum temperature and changes in precipitation amount and seasonality
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