RE:Steely Fly Swap
Either right away or 'tween.
Doing it right away would mean to send 6 from the spring tying you're doing, and getting some diversity in return to place in that spring native box before it all begins. Although the Cascade closures mess things up, we can still C&R on the peninsula and Columbia streams with these flies.
Doing it between April and June in the tween season is the other option. In that case we could submit a mix of spring and summer flies, those that survived the last season and those that bring promise for fooling the first summer fish.
I was originally thinking during the coldest part of the year... right about now. What are your thoughts?