This guy was caught this year on Feb 10th in Wisconsin in water temps in the mid 30s. They eat all year and can be caught all year, but are more active in the summer months. In other words, grab your rod and go now instead of waiting. Seriously my best time in still in the summer months. I move to chasing them when the vegetation on the trout streams gets over my head and it just becomes ugly to chase trout in July and August. I fish almost exclusively for carp then.