The USDA has come out with a new hardiness zone map with help from Oregon State University PRISM Climate Group among others. Check out the new map: New USDA Zone Map
Remember if you live west of Mt. Washington Blvd. you are in a different micro climate than the rest of Bend being at a slightly higher elevation and more prone to harsh winds. Deschutes River Woods and Sunriver are also different (colder) climates.
Shop at our local nurseries and ask lots of questions for the most success!