Blue-Winged Olive (BWO)
The Blue-Winged Olive matches the little olive mayflies that hatch on the worst days of the year - drizzle, cold, grey skies - when the season's best dry-fly fishing quietly happens.
BWOs are the mayflies that love misery: the drizzlier and rawer the afternoon, the thicker the hatch of these little olive-bodied, smoke-winged duns - and the harder the trout feed on them. An olive imitation in 16-22 turns the days fair-weather anglers skip into the best surface fishing of spring and fall.
What it imitates
Baetis mayflies - small olive-grey duns that hatch heavily on overcast, cool, even snowy afternoons, spring and fall.
When & where it wins
The ugly-weather window, 1-4 pm on grey days; tailwaters and rich freestones. If it's drizzling in October and fish are rising - it's this.
How to fish it
Dead-drift to steady risers on 5-6X; BWO eaters hold narrow feeding lanes, so accuracy beats distance. A sunk 'cripple' trailed behind doubles hookups.
Sizes & variants
16-22; parachute, comparadun and cripple versions all earn boxes - the cripple (half-drowned emerger) often out-fishes the dun.
Tying notes
Slim olive body, dun hackle/wing - restraint is the skill; fat BWOs get refused.
Mistakes at the vise and on the water
Staying home in the drizzle (the whole point), fishing size 14 when naturals are 20, and ignoring the crippled/emerger stage picky fish prefer.
Kit for fishing flies
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