There are a ton of small specialty farms in Oregon, in pretty much all the climates (even the short-season ones like mine).
Here's a link to OSU's Oregon climate Service:
Welcome to the Oregon Climate Service
You can get climate data, including growing days, precipitation, minimum and maximum temperatures, amount of snowfall, length of time between frost probabilities.
Check altitudes, though - if you are looking at land that's 500' or more higher than the climate station the records were created for, you'll have a very different climate.