The Blue Dun is a classic dry fly pattern that imitates a range of small mayflies, particularly the Blue-Winged Olive and early season duns. With its subtle slate-blue body and upright wings, this fly is ideal for clear water conditions and picky trout, especially during overcast days when smaller mayflies are hatching. Its a reliable pattern for spring and fall, when these hatches are most prolific.

Tied with premium materials, the Blue Dun features a slim, realistic profile that sits delicately on the surface film. Its traditional hackling provides buoyancy and stability, allowing it to float well in calm runs and light riffles. The understated coloration helps it blend into natural insect hatches, making it a go-to fly for match-the-hatch scenarios.

To fish the Blue Dun effectively, cast upstream to rising fish and allow it to dead drift through the feeding lane. Use a long, fine leader to minimize drag, and apply floatant to keep the fly riding high. Its also a great choice as a lead fly in a double dry setup when fish are selectively feeding.