The best time to fish dry fly is during hatch, when the fish are really concentrating on the surface, when there are emerging insects or insects falling into the water. But you can fish dry flies almost any time.
When should I start dry flies?
Dry flies are best to use when you notice a hatch or trout surfacing. The little ripples on top of the surface show the trout feeding on whatever is on top of the water. These hatches generally happen when the sun is rising or setting.
Can you fish dry flies year round?
Midges live in every trout stream and they hatch year-round. ... From April through September, the bigger mayflies, caddisflies, and terrestrials often overshadow their hatches.