Fly Fishing Trout Fly
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Fly Fishing Nymph

Pennsylvania: Yellow Breeches Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Blue Winged Olive20            
Little Black Stonefly16            
Blue Quill18             
Hendrickson14             
Red Quill14             
Blue Winged Olive14            
Gray Fox14             
March Brown12             
Slate Drake12 - 14          
Sulphur16            
Light Cahill14 - 16            
Yellow Drake12            
Terrestrials (various)16 - 20           
Slate Drake6 - 8            
Trico24            
White Fly14 - 16            
Click Fly Name to see patterns that imitate it.