Looks like a pearly everlasting to me, Anaphalis margaritacea. We had a patch of them in my coastal mountain home area of Oregon, about 80 miles south of Portland.
Here are more pics to look at and info:
USDA Distribution of pearly everlasting
Some herbal/edibility info on it:
Pearly Everlasting on EdibleWildFood.com
And some more pics, ID info, and
medicinal uses:
Pearly Everlasting on Montana Plant Life
The flowers are very distinctly ball-shaped, with white bracts and then yellow furry parts inside, as such from Wikipedia:
See what you think,
Kim