Jordan,
Darrington is mainly a blacktail area, very brushy unless you are hunting a recently logged area. If you get back in to the high country to the east you could find some muleys. Most people who are looking for muleys go to the eastside of the state, Okanogan & Chelan counties, the Kettle Crest, and the snake river area. There are many other counties in E WA that hold muleys but they are mostly private land. This months Fishing and Hunting News has a lot of "Generic Info" (typical for F & H News) on the east side. Hope this helps a little.
Dan