Spring Brook Trout Fly Fishing in the Mid Atlantic - This issue focuses on the native brook trout fishing in the Shenandoah National Park, George Washington National Forest and Jefferson National Forest from March until May. Learn which aquatic insects are active at which time. Those of you living South of this region (Great Smokey Mountains) will find the approximate dates we speak of to be two to three weeks late for your fishing conditions. Those of you living North of this Region (PA, Southern Adirondacks & Catskills) will find the dates we reference to be two to three weeks early for your fishing.