I've rarely been successful when I try to locate harvestable jacks, but I often catch them incidentally while fishing for cutthroat in August/September, and they are fantastic quarry on a 6-wt. fly rod. They eat trout streamers better than trout, and they go berserk when you hook them.

Have harvested a handful over the years, and they are as good as the adults in most applications.

Jacks are cool. Get 'em if you can!