Now the city is classified in zone 8b because the average annual coldest ... weekend when you’re enjoying some of those delicious strawberries that came forth from the commonwealth’s soil.

Most of the Portland area — and much of the Willamette Valley — remained in zone 8b, which indicates the average coldest temperature is in the 15-20-degree Fahrenheit range. The map assigns 13 ...

(For Portland and much of the valley, that is zone 8b, where minimum temperatures reach 15 to 20 degrees.) But 38.6% of Oregon land shifted warmer, to the next half-zone, and about 1% moved a full ...