The answer is yes - probably
The laws in Washington State are pretty much the same as where you are coming from.
If your yacht is legal at home it's legal in the San Juan's, but only for 60 days. After 60 days you will be expected to leave the state or become compliant.
So you get a free pass for two months, but if your monster has expired tags, (vessel or rig) or you do not have a valid boaters card, you may be subject to re-training and fines.
And that's the way it is!
Lets go boating.