I think the northwest would be ok.... Washington or Oregon! I know this thread is about Washington but northern Oregon would be possible.

The area is rich in natural resources and good water! It may rain but with a little work we would have clean cloths and food grows good! And the forest is good cover and wood to burn and to make shelter!

Volcanos also don't explode all the dig time so no real worries. St. Helens had a growth spert, and is dormant. Also it could be used for thermal heating or for electricity. Also they have caves that stay the some temp all year long!

Washington is a good option.