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.

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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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

Filters

CDC Pheasant Tail-Beadhead

Comparadun

CDC Comparadun

CDC Biot BWO Thorax - Mayfly Dry Fly

Cove's Pheasant Tail

Cosmic Baetis - Tungsten

Camden Baetis - Glass Bead

Cripple Thor - Mayfly Dry Fly

Crystal Hunchback-Beadhead

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

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**A Valid USPS Address is REQUIRED on ALL Orders. Click Here for Shipping Info**

**A Valid USPS Address is REQUIRED on ALL Orders. Click Here for Shipping Info**

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

Filters

Compare products

A Valid USPS Address is REQUIRED on ALL Orders. Click Here for Shipping Info

A Valid USPS Address is REQUIRED on ALL Orders. Click Here for Shipping Info