I believe after April first, all studded tires are illegal throughout Washington State. This happens ever year- there is no sense keeping studded tires on cars in July, or April for that matter. Well, I don't think there's much sense to Westsiders having studded tires anyway (if they don't travel over the passes).... but that is another story.

Come November, you can put studded tires on again.

http://www.wsdot.wa.gov/news/mar03/studdedtires_removal.htm
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"If fishing is like religion, then flyfishing is high church." -Tom Brokaw