If weight is how you deem a trophy then I would say late Feb thru March on the big four here, down at Washington it will be a couple weeks earlier. I don't look at weight so much myself, a 17 inch fish is a trophy whether it weighs 3.5 pounds or 2.75, a stud is a stud no matter the time of year. I consistently catch fish over 16 inches in the summer time and accasionally get over the 17 inch mark.
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