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Fly Fishing Nymph

Wyoming: North Platte River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Midges (various)20 - 28 
Blue Winged Olive20 - 24             
Golden Stonefly8 - 10            
Green Drake10 - 12             
Salmon Fly4 - 6             
Yellow Sallie12 - 14            
Blue Winged Olive14             
Pale Morning Dun16 - 18            
Terrestrials (various)6 - 18           
Trico20 - 24           
Mahogany Dun16 - 18            
Click Fly Name to see patterns that imitate it.