I was going to suggest that you go the last 4 days of the season. Peak abundance doesn't occur until after the closure date. And we don't know what day it will close. I guess it depends how risk averse you are. The last few years it has closed after April 15, so you might plan to fish April 11-15. You won't be fishing the peak, but you'll be fishing as close as you can without risking it being closed when you're scheduled to be there. Springer fishing is a lot like winter steelhead fishing - the more flexible your schedule, the higher the probability you can fish when the fishing is best.

Sg