To success in gardening, it’s important to know YOUR garden’s  USDA planting zone.
Every region has micro-climates, so they have different zones, for example:

Medford, Oregon is USDA Zone 8a, 10°F to 15°F
Ashland, Oregon is USDA Zone 7b, 5°F to 10°F

You can check your area with this interactive map, click on your city and the zone pops up.

http://www.plantmaps.com/interactive-oregon-usda-plant-zone-hardiness-map.php

Always check USDA Zone on plants at the nursery, before you buy.