Fly Fishing Trout Fly
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Fly Fishing Nymph

Colorado: Rio Grande Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Midges (various)16 - 18     
Streamers (various)2 - 10          
Caddis (various)10 - 16          
Green Drake10 - 12          
Stoneflies (various)4 - 18            
Pale Morning Dun12 - 18            
Red Quill10 - 16           
Terrestrials (various)8 - 16           
Blue Winged Olive12 - 18            
Click Fly Name to see patterns that imitate it.