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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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    Sparkle Duns Dry Fly

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    A great emerger, dun, or cripple pattern.  These flies ride low, have a trailing shuck, are easy to cast and see. Two excellent colors, for a plet...

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    Flashback Soft Hackle Pheasant Tail - Tungsten

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    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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    Pheasant Tail - Tungsten

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    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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    Flashback Hare's Ear - Tungsten

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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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    Barbless Beadhead Flashback Pheasant Tail

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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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    Barbless Beadhead Pheasant Tail

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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 Pheasant Tail - Tungsten

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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 vul...

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    Comparadun

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    This very versatile pattern is a great spring creek pattern.  Also very popular in slack water and pools. Great emerger and spent wing spinner pat...

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    Spanish Nymph - Tungsten

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    One of many highly effective patterns that originate in the Czech/Euro field. A slim body, synthetic fibers, and a tungsten bead help this patter...

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    Parachute Blue Wing Olive Blue Dun Post - Mayfly Dry Fly

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    One of the most prolific and long lived hatches. Presented here with a blue dun post, to closer match the wing of the natural. If you have never f...

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    Pheasant Tail UV-Beadhead

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    Lets face it fish like shiny stuff, it is often what attracts them in the first place. Pheasant Tail UV contains UV dubbing in the thorax that he...

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    Bead Wing Midge - Solitude

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    One can never have to many midge patterns, and this a great nymph to add to the box. Bead Wing gives this emerger a look that only a transparent ...

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    Baetis Zinger - Mayfly Dry Fly

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    The marvelous baetis like the energizer bunny, just keeps on ticking. A very exact imitation of baetis during many hatches. These insects can va...

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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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    Cove's Pheasant Tail

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    Everyone, in mean everyone, has a pheasant tail nymph in a fly box. The Cove's Pheasant Tail is yet another pattern spawned from the ingenious p...

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    Little Green Machine - Tungsten

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    Extremely effective and popular mayfly nymph imitation. Particularly effective in the late season baetis hatches. Tied in the sizes that seem to...

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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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    Darth Baetis - Umpqua

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    This juicy little Baetis pattern produces fish under the spookiest of circumstances. From Colorado to Maine, baetis nymphs are a huge source of foo...

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    Hot Spot Pheasant Tail

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    Like all the Pheasant Tail patterns, this one has a spot in every trout fisher's fly box. Hot spots make more sense that one might think at first...

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    Picky Eater Perdigon - Tugnsten - Umpqua (Barbless)

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    Proudly designed by a Big Y Customer and Hood River local. "This fly features a simple body design that helps it sink quickly and a natural CDC col...

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    Flymph BWO

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    Flymphs have been around longer than most fly fishers realize. First coined by Pete Hidy in 1941, it is simply a floating nymph.  With today's cla...

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    Moonshine Mayfly - Beadhead

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    Ton of flash gives this fly an more emergance look to it. Rootbeer glass bead creates a nice head with a translucent look to it.  A great addition...

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    Missing Link Mercer's - Umpqua

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    The Missing Link is that fly that works even when when the hatch might be not quite as expected. You may have thought PMDs were going to pop today,...

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    Barr's Emerger BWO - Glass Bead

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    Barr’s BWO Glass Bead The Barr’s BWO Glass Bead is a subtle, effective mayfly pattern designed for selective trout feeding on Blue-Winged Olive nym...

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    Flash Quill Nymph

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    Blue Quill, Black Quill, Red Quill, Quill Gordon, are all essentially the same fly in different color variations meant to mimic a specific mayfly ...

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

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    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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    Parachute Extended Body BWO - Solitude - Mayfly Dry Fly

    $2.37
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    This fantastic little dry fly for the pickiest trout. Soft and realistic, this is a proven winner. Customer requested, this one should have been i...

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    Arnot's Pocket Drone Pink Bead - Fulling Mill (Barbless)

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    Arnot’s Pocket Drone – Pink Bead (Barbless) Baetis & Mayfly Nymph with Hot Orange Butt Arnot’s Pocket Drone – Pink Bead (Barbless) is a...

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    Harrop's CDC Biot Emerger BWO - Solitude - Mayfly Dry Fly

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    Harrop’s CDC Biot Emerger BWO – Solitude When trout key on Blue Winged Olives just before they break the surface, few patterns are as effective as ...

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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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