What is Portland, Oregon's plant hardiness zone?

Question

I have read several different answers online, from 4 to 6 to 8 to 9. So searching for the answer does not work. Can somebody who tends plants and lives in Portland tell me what it really is? Thank you!

Answer 1

The USDA zone is 8 so we can grow subtropicals and get lucky sometimes with a mild winter and keep them over. So you can get by growing zone 9 plants, sometimes. The only reason some one would mention zone 4 might be after an ice storm on the Columbia took out a lot of plants. Minneapolis, MN is in zone 4 where it regularly gets to minus 20.
For myself I have patches that are warmer & colder so I know I range from maybe zone 7b to zone 8. I have recorded cold spells in the midteens but never single digit cold. The last two winters I have kept an Abutilon megapotamicum going in my most sheltered area. They are not supposed to live in zone 8. Neighbors have several tender hebes and other New Zealand introductions that are doing well.

This is a local guy with a good plant list for here
http://www.rodsgarden.50megs.com/

Answer 2

This Site Might Help You.

RE:
What is Portland, Oregon's plant hardiness zone?
I have read several different answers online, from 4 to 6 to 8 to 9. So searching for the answer does not work. Can somebody who tends plants and lives in Portland tell me what it really is? Thank you!

Answer 3

Usda Zones Oregon

Answer 4

Zone 7 - 8 depending on where in the Portland area you are. Elevation and proximity to the 2 rivers causes a difference. However plant growth should be okay for either zone.

Answer 5

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Those are indeed valid examples of climate change. What the deniers like jim are arguing is that these changes aren't evidence that the climate change or global warming are human-caused as opposed to natural. This is true - there is loads of other evidence that they're anthropogenic (for example, see the links below), but what you provide are just examples of the climate changing. The 'climate always changes' statement is rather worthless. As long as the global temperature is relatively stable, then the global climate should be *relatively* stable. That's not to say there won't be minor changes, but if the temperature is relatively stable then there shouldn't be significant shifts like the growing season starting several weeks earlier than it did just a few decades ago. That's evidence of a significant climate change.

Answer 6

We have nurseries in Oregon and the hardiness zone is very difficult to pinpoint exactly. About the best answer anyone can give you is Zones 6-8.

Answer 7

This should answer your question!
http://www.usna.usda.gov/Hardzone/hzm-sw1.html