Almost Dun Mayflies

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Almost Dun Patterns are a highly effective emerger pattern that imitates a mayfly caught in the vulnerable stage between nymph and dun. At this point in its life cycle, the insect struggles in the surface film, making it easy prey for trout that often key in on these transitional insects rather than fully emerged adults. Tied with a slender body, trailing shuck, and upright wing profile, the Almost Dun has the perfect silhouette of a mayfly halfway to the surface. The trailing shuck suggests the last remnants of the nymphal case, while the upright wing imitates the insect just as it’s preparing to take flight. Its low-riding design ensures the fly sits partially submerged, creating the natural impression of an emerging insect. The Almost Dun is especially effective during prolific mayfly hatches in spring and fall, when trout grow selective and refuse standard dry flies. It works best on fine tippet with a drag-free drift, floated through seams, slicks, or foam lines. For anglers targeting tricky, hatch-matching conditions, this pattern is a subtle yet deadly solution. Show more