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About the Western Mountains Region

The Western Mountain region includes states that are in or border the Rocky Mountains – Idaho, Utah, Nevada, eastern Washington and Oregon, parts of Montana, Colorado and Wyoming, and northern Arizona and New Mexico. With one of the longest growing seasons, gardeners here count on 180 to 210 frost-free days with plenty of heat. Winter averages 19 to 29°F with extremes as low as –15°F. Summer temperatures range from the high 80s to low- to mid-90s. Frosts in late spring and early summer can put a damper on a gardener’s ability to grow frost sensitive perennials and warm season vegetables such as tomatoes and peppers. Winters can be dry or very snowy, and very cold. The Western Mountains see an average annual precipitation of 10-20 inches, except in northern Idaho and Montana which tend to be much wetter, averaging 40-50 inches annually. Mountain soils in the Rockies are poorly developed, being extremely thin and young.

 

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