There are sumer run and winter run. I believe winter is done now we wait till June but every river has different rule and reg fishing steelhead. Like North Fork Stillniquamish is barbless fly fishing only and south fork is open to drift fishing.. washington department lic has an application you can down load has all dates, regs, on Rivers and lakes salt water etc,,,
Only accurate answer you can get will be from the rules and regulations.
Steelhead fishing is just poor statewide nowadays buy reg dependant you can find Steelhead all year. Generally you find Summer runs are best June through July, winters December through March. But Steelhead often stay in rivers much longer than salmon. I know people who have caught summer runs in the middle of winter
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