Scientific Name Common Name Size Mar Apr May Jun Jul Aug Sep Oct
Taeniopteryx navalis Black Stonefly 18-14 1 ---- 15 . . . . .
Strophopteryx fasciata Brown Stonefly 18-16 1 ---- 15 . . . . .
Epeorus pleuralis Quill Gordon 16-12 1 ---- 15 . . . . .
Apatania nigra Smokey Wing Sedge 22-20 1 ---- 15 . . . . .
Baetis tricaudatus Blue Wing Olive 20-18 15 ---- 15 . . . . .
Ephemerella subvaria Hendrickson 16-12 30 ---- 30 . . . . .
Pteronarcys dorsata Giant Black Stonefly 4-2 2xL . 1 30 . . . . .
Isogenoides hansoni Black Stonefly 6 2xL . 5 ---- 1 . . . .
Paraleptophlebia adoptiva Sm. Dark Quill 20-18 . 15 30 . . . . .
Leptophlebia cupida Lg. Dark Quill 14-12 . 15 30 . . . . .
Brachycentrus appalachia Apple Caddis 18-16 . . 1 15 . . . .
Drunella cornuta Blue Wing Olive 16-14 . . 7 ---- 20 . . .
Stenonema vicarium March Brown 12-6 . . 10 ---- 10 . . .
Acentrella turbida Blue Wing Olive 26-22 . . 10 ---- ---- ---- ---- 15
Ceratopsyche morosa Spotted Sedge 18-16 . . 10 25 . . . .
Ephemerella rotunda Sulphur 14-12 . . 12 30 . . . .
Ephemerella invaria Sulphur 16-14 . . 12 30 . . . .
Psilotreta labida Dark Blue Sedge 16-14 . . 15 10 . . . .
Cheumatopsyche campyla Little Sister Sedge 22-20 . . 15 15 . . . .
Ephemera guttulata Green Drake 10-6 . . 15 15 . . . .
Psilotreta frontalis Black Caddis 16-14 . . 15 20 . . . .
Hydropsyche recurvata Spotted Sedge 16-14 . . 15 25 . . . .
Ephemera simulans Brown Drake 12-10 . . 15 ---- 21 . . .
Ceratopsyche sparna Spotted Sedge 18-16 . . 15 ---- ---- ---- 20 .
Ceratopsyche slossonae Spotted Sedge 18-16 . . 15 ---- ---- ---- 30 .
Ephemerella dorothea Sulphur 20-18 . . 20 ---- 30 . . .
Ceratopsyche bronta Spotted Sedge 18-16 . . 20 ---- ---- ---- 30 .
Acroneuria lycorias Golden Stone 6-4 2xL . . 25 15 . . . .
Lepidostoma togatum Plain Br. Sedge 22-20 . . 25 ---- ---- 30 . .
Isonychia bicolor Slate Drake 12-8 . . 28 ---- ---- ---- ---- 30
Attenella attenuata Blue Wing Olive 20-18 . . . 1 20 . . .
Paraleptophlebia mollis Sm. Dark Quill 20-18 . . . 1 20 . . .
Mystacides sepulchralis Black Dancer 20-18 . . . 1 ---- ---- 20 .
Stenacron heterotarsale Cahill 16-12 . . . 1 ---- ---- 30 .
Epeorus vitreus Pale Eve. Dun 16-12 . . . 1 ---- ---- ---- 30
Rhyacophila species Green Sedge 16-14 . . . 10 ---- 30 . .
Stenonema ithaca Light Cahill 14-10 . . . 10 ---- 15 . .
Stenacron canadense Light Cahill 14-12 . . . 10 ---- 30 . .
Ephemerella needhami Blue Wing Olive 20-16 . . . 10 25 . . .
Sarratella deficiens Blue Wing Olive 24-22 . . . 10 ---- ---- 30 .
Ephemera varia Yellow Drake 8-6 . . . 12 28 . . .
Anthopotamus distinctus Yellow Drake 10-8 . . . 15 ---- 25 . .
Drunella cornutella Blue Wing Olive 18-16 . . . 15 ---- 15 . .
Timpanoga simplex Blue Wing Olive 22-20 . . . 15 ---- 20 . .
Paraleptophlebia debilus Sm. Dark Quill 20-18 . . . . 1 ---- ---- 20
Tricorythodes species Trico 26-24 . . . . 1 ---- ---- 31
Serratella serratoides Little Tan Dun 22-20 . . . . 10 ---- 15 .
Brachycercus lacustris Black and Gray 22-20 . . . . 20 ---- 10 .
Leucrocuta hebe Sulphur 20-18 . . . . . 1 ---- 5
Ephoron leukon White Fly 10-8 . . . . . 10 30 .
Neophylax oligius Autumn Sedge 18-16 . . . . . . 15 31
This Chart was compiled from the in depth notes that I've taken over many years. The dates shown are from the earliest date that I've seen even one of the listed insects hatch up to the latest date that I've seen it hatch. This means that while beginning dates listed may appear to run early and ending dates may appear to run late, you will always be prepared. It is better to have just a few more fly patterns in your box even if that insect isn't hatching, rather than an insect hatching and not having the right fly to match it.