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Fly Fishing Nymph

Montana: Clark Fork River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Midges (various)20 - 28 
Caddis (various)14 - 18        
Gray Drake12 - 16           
Olive Stonefly12 - 14           
Blue Winged Olive16 - 22          
Salmon Fly4 - 6            
Green Drake10 - 12             
Pale Evening Dun14 - 18             
Pale Morning Dun14 - 18             
Yellow Sallie12 - 16             
Terrestrials (various)6 - 18           
Mahogany Dun12 - 16            
Trico22 - 24            
Click Fly Name to see patterns that imitate it.