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BWO or Baetis

Blue Wing Olive hatches are one of the most consistent and important mayfly hatches for trout, especially in spring and fall.

Best Flies for the Blue Wing Olive (BWO) Hatch

Best time: Overcast days, late morning to afternoon
Season: Spring and fall (can occur year-round)
Water: Slow to moderate currents, tailwaters, spring creeks
Trout behavior: Selective feeding on small mayflies and emergers

Match your fly to trout behavior—dry flies for surface feeding, emergers for selective fish, and nymphs when trout are feeding below.

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  • Flashback Pheasant Tail-Beadhead

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    A great improvement on this all-time classic pattern. Many nymphs take on a very shiny appearance right before emerging. Trout key in on this vuln...

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  •

    Pheasant Tail-Beadhead

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    One of the top five trout nymphs ever tied on a tippet. A near perfect imitation of the blue wing olive nymph, also works great for a general mayf...

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    Flashback Soft Hackle Pheasant Tail - Tungsten

    $1.32
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    $1.32

    Take a beadhead Pheasant Tail and give it a heavier bead, and you have a faster sink rate, and slightly different action to foll even the wariest ...

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  •

    Blue Wing Olive Wet Fly

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    This prolific hatching mayfly makes itself available to fish and fly fisher year around in many locations. A real fish producer. Wet flies are a s...

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    Soft Hackle Pheasant Tail Glass Bead

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    Swinging soft hackles for trout has gained some popularity of late. This pattern is particular designed with that in mind. While it can be fishe...

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    Film Critic - Umpqua

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    Bob Quigley, the king of the "film” designed the Film Critic to match mayflies at their most vulnerable stage of the hatch, while emerging from nym...

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    Christiaens' GT Adult - Montana Fly Co - Mayfly Dry Fly

    $2.93
    $3.25
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    $3.25
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    $2.93

    It's a great all-around mayfly dry The klinkhammer-style curved hook leaves much of the fly's body under the surface, represents a struggling emer...

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Blue Wing Olive (BWO) hatches often bring out selective trout, especially on pressured rivers and tailwaters. Matching size, profile, and presentation is usually the difference between refusals and eats. Most BWO fishing happens in sizes 16–20, with emergers outfishing dries when trout are feeding subtly in the film. Target softer seams, eddies, and slower edges during active hatches.

BWO hatches peak in spring and fall and are strongest during overcast or rainy weather. These mayflies can hatch multiple times a year and often produce longer, more consistent windows than other mayflies.

Trout key in on specific stages of the insect, so adjust your flies as their behavior shifts. Use dries when fish are rising confidently, switch to RS2s or emergers during subtle sips, and downsize if fish are refusing your presentation.

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