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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Hot Spot Pheasant Tail
$0.99Original priceOriginal price $0.99 - Original price $0.99Original price$0.99 - $0.99Current price $0.99Like 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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Harrop's CDC Biot Emerger BWO - Solitude - Mayfly Dry Fly
$2.37Original price $2.63Original price $2.63 - Original price $2.63Original price $2.63$2.37 - $2.37Current price $2.37Harrop’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 ...
View full details$2.37Original price $2.63Original price $2.63 - Original price $2.63Original price $2.63$2.37 - $2.37Current price $2.37Coming soonValue must be grater than or equal to 1.
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.