Halibut season in Washington is very limited. It starts in early May on Thurs, Fri and Saturdays and lasts until the quota is taken (usually a couple of weekends in May, plus a little quota reserved for 1 day in June after school is out. The weather and ocean are usually crappy for much of the fishery although they can be caught in areas 5 and 6 in nicer water (area 5 is Sekui, area 6 is the E end of the straight. Right now if you want halibut, you have to fish Canadian waters with a B.C. Canadian license AND the Canadian license must be purchased while you're physically in Canada. E.g. you can't use the electronic license to fish halibut (that's mostly to prevent charter boats from issuing day of licenses out of Neah Bay and running clients across the border to get hailbut.