I usually don't catch them till August/September ...but I know May/June are traditionally the time to target them here...always a treat when you realize what you have at the end of the line
I look for them down the cape each spring before I get going with bass fishing. I did get one on cape a few weeks ago, it was pretty small maybe 3-4 lb range but was still great to see. I think the last time I caught one was 3 or 4 years ago.