Look here to see if this is your region

boffer 3/28/2010, 7:42 pm

Western Mountains and High Plains: USDA zones 2-8; AHS Heat Zones 4-10; Sunset Zones 1, 2, 10

It is a huge area for
one region. The eastern border runs north-south through North Dakota and South Dakota, western Nebraska, Kansas, and to the panhandle of Oklahoma. Turning west from the panhandle the reign travels across northern New Mexico and Arizona before turning north near Las Vegas, Nevada, and running up the spine of the Sierra Nevada Mountains in California. It continues north along the eastern slope of the Cascade Mountains to include the high deserts of eastern Oregon and Washington.
From here it follows the boarder back to North Dakota, though it
actually includes the Canadian Rocky Mountains and the High Plains of
Canada.

Growing season.
From as low as 70 days in the Wyoming mountain area to 150 days near
large bodies of water. Please refer to the link. Not only is the area
vast with a USDA 8 in southern Nevada and as low as 2 in Wyoming,
microclimates rather than hardiness zone (a measure of last frost date
averages) dictate seasons. Bodies of water such as Flathead Lake in
northern Montana extends the season in the north. In Wyoming, the
shadow of the Rockies can mean frost on any day of the season and cuts
practical gardening time to about 70 days. Wind on the high plans can
dehydrate even trees unless heavy protection is provided. Even the
backside of a barn can provide a microclimate with its safe haven from
the wind.

National Gardening Association.

http://www.garden.org/regional/report/description/full/15


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