Fly Fishing Trout Fly
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Fly Fishing Nymph

Colorado: Colorado River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Midges (various)22 - 28       
Blue Winged Olive16 - 22             
Caddis (various)10 - 18        
Attractors (various)8 - 18         
Salmon Fly4 - 6            
Golden Stonefly8 - 10            
Pale Morning Dun16 - 20            
Red Quill14 - 18             
Terrestrials (various)6 - 18            
Click Fly Name to see patterns that imitate it.