Dr. Dave - I agree with your thoughts for the probablity of a single bluegill spawn in the plant hardiness growing zones of 5 and colder; places such as NY, PA, OH, IN, IL, IA, KS, CO WY AND areas more northern. I think the length of the bgill spawn in these areas is somewhat extended in time compared to say a yellow perch spawning season. I also sometimes see a brief spawn of bgills late in the summer. The late bgill spawns are probably less frequent in the more northern regions with and cooler summers.
