How to tie the Blue Wing Olive BWO Thorax Dun

In this new fly tying video, Barrett shows you how to tie the Blue Wing Olive (BWO) Thorax Dun, a simple pattern that will fish well all year and should be in your winter trout hunting arsenal.

Blue Wing Olive

Blue Wing Olive BWO Thorax Dun materials available at
Hook: TMC 100 14-20
Thread: 8/0 gray uni thread
Tail: Gray fibbets
Body: Fine and dry olive dubbing
Hackle: Dun dry fly hackle
Wing: Gray Antron

Scott Richmond from WestFly has a great article on tips for fly fishing the BWO hatch: I’ve never spent a winter day on a Western stream when there weren’t a few BWOs hatching in the early afternoon. Never.

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