Marine area 7 opens for crab two weeks later than the rest of Puget Sound. Opening on July 15th for the Southern portion of Marine area 7, and on August 16th in the Northern part (Gulf of Georgia). Once open, the crab fishery is open Thursday through Monday each week.
Check the WDFW map to see which part of Marine Area 7 you are fishing in, and also check out the crab resources to help identify males/females and size restrictions.
http://wdfw.wa.gov/fishing/ see the sportfishing pamphlet for a map