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Emergence Schedule
Compiled by John Long for the Challenge Chapter - Trout Unlimited

"X" Denotes Peak Period


SIZE NAME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
18/20 Allocapnia granulata or vivipara
Tiny Early Winter Black Stonefly
****
****
****
16/20 Nemouridae and Leuctridae
Tiny Late Winter Black Stonefly
*
****
****
10/14 Taeniopteryx Nivalis
Early Black Stonefly
*
****
****
12/14 Brachyptera faciata
Early Brown Stonefly
**
****
*
18/20 Baetis vagans
Blue Wing Olive Mayfly
***
X*** *XX* **** ***
16/18 Paraleptophlebia adoptiva
Slate Wing Mahongony Mayfly
**
XX** ****
12/14 Ephemeralla subvaria
Dark Hendrickson Mayfly
**
XX*
16/18 Chimarra aterrima
Little Black Caddis
**
XX** **** **** ****
12/14 Leptophlebia cupida
Borcher's Drake Mayfly
*
**** **** **** **
SIZE NAME JAN FEB MAR APR MAY JUN JUL AUG SEP OCT
14/16 Brachycentrus americanus
Grannom Caddis
*
**** **** ****
2/8 Pteronarcyc dosata
Midwestern Salmon Fly Stonefly
*
**** **** **
10/18 Rhyacophilidae fenestra
Green Rockworm Caddis
**** ****
8/14 Perlodidae lsogenus and lsoperla
Medium Brown Stonefly
**** **** ****
10/14 Siphloplecton basale
Great Speckled Olive Mayfly
*XX
**** **
14/20 Hydropsyche bronta & simulans
Net Building Caddis
***
**** **** **** **** ****
16/18 Ephemeralla dorothea
Sulphur Dun Mayfly
**
XXX* *
14/18 Alloperla caudata & imbecilla
Little Yellow and Little Green Stonefly
**
**** **** **** **** ****
14/16 Nectopsyche
White Miller Caddis
**
**** **** **** **** ****
20/22 Baetis cingulatus
Blue WIng Olive Mayfly
**
**** **** ****
SIZE NAME JAN FEB MAR APR MAY JUN JUL AUG SEP OCT
14/16 Ephemeralla invaria
True Hendrickson Mayfly
*X
X*** ***
14/16 Ephemeralla rotunda
Light Hendrickson Mayfly
**
***
10/12 Stenonema vicarium
American March Brown Mayfly
**
**** **
12/14 Stenonema fuscum
Sand Drake Mayfly
*
XX** **
12/14 Siphlonurus rapidus
Early Gray Drake Mayfly
*
X**
10/12 Ephemera simulans
Brown Drake Mayfly
*
XX** *
8/10 Phryganlidae ptilostomis
Great Orange Sedge Caddis
XXXX XXXX
8/12 Green Oak Worm/Greenie Worm
Caterpillar
•XX* *
20/28 Diptera
Midges
**** **** **** **** ****
10/12 Isonychia sadleri
Mahogany Dun Mayfly
**X
XX**
SIZE NAME JAN FEB MAR APR MAY JUN JUL AUG SEP OCT
6/8 Hexagenia limbata
Great Olive Winged Drake Mayfly
**X
XX*
10/12 Isonychia bicolor
White Gloved Howdy Mayfly
***
**** **** ***
12/14 Stenonema canadense
Light Cahill Mayfly
**
**** *
10/12 Sephlonurus alternatus
Late Gray Drake Mayfly
**
XX**
10/12 Ephemera varia
Golden Drake Mayfly
**
**** *
6/8 Paragentina media
Big Golden Stonefly
*
**** *
14/18 Ephemeralla Lata
Slate Wing Olive Mayfly
*
**** ***
22/24 Pseudocloen anoka
Tiny Blue Winged Olive Mayfly
*
**** **** ****
18/20 Ephemerella simplex
Dark Slate WIng Olive Mayfly
*
**** **** ****
8/24 Terrrestrials
Ants, Grasshoppers, Beetles, Jasids
*
**** **** **** ****
24/26 Tricorythodes stygiatus
Tiny White WIng Black Mayfly
***
**** **** ****
16/18 Paraleptophlebia debilis
Small Slate Mahogany Dun Mayfly
*
**** **** ****
18/20 Mystocides sepulchralis
Black Dancer Caddisfly
**** ****
22/24 Baetis pygmalus
Little Medium Olive Mayfly
***
****
12/14 Ephoron album
White Fly Mayfly
**
****
14/16 Baetis heimalis
Slate WIng Brown Mayfly
**** ****
SIZE NAME JAN FEB MAR APR MAY JUN JUL AUG SEP OCT

"X" Denotes Peak Period