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Fly Fishing Nymph

Montana: Blackfoot River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
March Brown12 - 14            
Blue Winged Olive16 - 20           
Salmon Fly4 - 6            
Golden Stonefly6 - 8           
Green Drake8 - 10            
Pale Morning Dun16 - 18           
Pale Evening Dun14 - 16           
Callibaetis14 - 16           
Yellow Sallie14 - 18            
Little Green Stonefly14 - 18            
Terrestrials (various)6 - 18             
Trico20 - 28             
Mahogany Dun12 - 16            
October Caddis8 - 10            
Click Fly Name to see patterns that imitate it.