My understanding that they keep them green during the Sounders season. They play at home on Friday and then not again until Sept 29th. It may be more work to get them blue, but assuming it would be dry in time, they have to do it for this game right?
Here is hoping we see many Seahawk TDs celebrated in beautiful blue end zones this Sunday!
By the way: Save your "soccer is stupid" responses for another thread. I love the Sounders, and negativity about the sport just isn't going to fly in this city.