What Planting Zone Is Oregon City?
What Planting Zone Is Oregon City? Oregon City, Oregon is in USDA Hardiness Zones 8b. What growing zone is Portland? Portland falls into USDA hardiness zone 8b (with average low temperatures from 15 to 20 degrees Fahrenheit) or 9a (with average lows from 20 to 25 degrees Fahrenheit) for parts of inner Portland. Portland (and