Welcome to the great northwest!
I live just outside of Seattle, WA.
Just to let you know, there have been reports of brown recluse spiders in WA and OR. Other spiders to watch out for are the Hobo Spider (they have no fear and can be aggressive) and the Wolf Spider. But keep in mind that these spiders hide pretty well and unless you go digging around in a wood pile you won't come across them. (Knock on wood)
If you're in Western WA or Southern OR watch out for black widows. There has been reports of black widows in Snohomish County north of Seattle too.
When I lived in So. Oregon for 2 years I use to go around the outside of my house with a broom litterally everyday! When I found out there were black widows down there I was so freaked out. After many many months I came across a black widow web. When I was brooming off one of my herb vases I heard the web "snap" I knew what it was.
If you continue to let your cat out on the deck/patio I would suggest keeping it cleared off so nothing can hide inside, under or around anything.
Here is a web site for you to check out.http://gardening.wsu.edu/library/inse005/inse005.htm
I would also be concerned with the bees around here. This time of year they are building their bees nests and can get aggressive if someone or something seems a threat to their home.