Hexagenia

The Hexagenia, often referred to as the "Hex," is a large, impressionistic mayfly dry fly pattern designed to imitate the Hexagenia limbata—one of the biggest and most prolific mayflies in North America. Known for their dramatic, late-evening to nighttime hatches during the summer months, Hexagenia mayflies can trigger explosive feeding behavior in large trout, bass, and even carp. This pattern is tied to mimic the adult dun stage, featuring a bushy silhouette, extended body, and wide wings for maximum surface presence.

The Hex pattern excels during peak Hexagenia hatches, which typically occur in June and July on lakes, large slow-moving rivers, and spring-fed systems. Its light-colored body and swept-back upright wings mimic the natural profile of the insect resting on the water’s surface, making it a deadly pattern during spinner falls and heavy emergence events.

Fish the Hexagenia pattern in low-light or evening conditions, especially near the banks and slow eddies where naturals congregate. Use a dead-drift presentation with long leaders and minimal drag to keep your fly riding naturally. Because the fish feeding during a Hex hatch are often large and wary, patience and precision are key. This fly also pairs exceptionally well with a floating line and a downstream swing or skated presentation in stillwater settings.