Fly Fishing Trout Fly
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Fly Fishing Nymph

New Mexico: Rio Costilla Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Terrestrials (various)8 - 18        
Pale Evening Dun12 - 22          
Pale Morning Dun12 - 22          
Caddis (various)10 - 18         
Crane Flies6 - 16         
Golden Stonefly4 - 16           
Gray Drake10 - 14         
Green Drake10 - 14         
Salmon Fly4 - 8           
Blue Dun12 - 18          
Light Cahill12 - 18          
Mahogany Dun12 - 18          
Midges (various)14 - 26          
Click Fly Name to see patterns that imitate it.