Mayfly Graphic Fishing HoodieMayfly Graphic Hoodie Fly Fishing Apparel Mayflies make up the bulk of the diets of our trout in Northern Idaho. BWO's begin hatching as soon as the winter weather starts to recede. March browns follow and really get the fish looking up in the April timeframe. Then green drakes, grey drake, and tan drakes make appearances throughout the summer months. Those with more entomological knowledge than me have finer distinctions than me, but the hatches are