Guide To Midwest USA Hatches - Global FlyFisher

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Guide To Midwest USA Hatches


Ephemera sp. Mayfly
Kim Conrad photo
By Steve B. Schweitzer

This hatch chart is representative of most common Midwestern United States hatches (Minnesota, Wisconsin, Illinois, Ohio, Michigan & Southern Ontario Canada).  For colder weather, adjust the chart 1-2 weeks out and for warmer weather, adjust the chart 1-2 weeks in advance.

The lighter colored bars () represent marginal periods to fish the emerger or dry fly pattern.  It's best to fish nymphs during this timeframe.

The darker colored bars () represent peak periods where surface action will be at its' finest.  Be sure to fish emergers and dry flies during this period.

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Name Size J F M A M J J A S O N D
Ants
Beetles
Crickets
Grasshoppers
12-18
Leeches
4-10
Sculpins 1/0-10
Freshwater shrimp
(scuds)
12-20
Midge
chironomids
16-28
Tiny Winter Black Stonefly 12-18
Baetis (transitional season hatches)
baetis spp
18-20
Early Stonefly 4-14
Micro Caddis
hydroptilitdae
18-22
Blue Quill
P. adoptiva
16-20
Grannom Caddis
Brachycentrus spp
14-16
Sulphers
Ephemerella spp
14-16
Yellow Sally's
Isoperia spp
10-12
Brown Stonefly
Cultus decisus
10
Gray Drake
Siphlonurus sp
10-12
March Brown (Gray Fox)
S. vicarium
10-14
Slate Drakes
Isonychia bicolor
10-12
Early Brown Stonefly 12-16
Dark Hendrickson
Ephemerella subvaria
12-14
Mahogany Dun
Paraleptaphlebia adoptiva
16-18
Large Black Stonefly 2-6
Dark Hendrickson
Ephemerella subvaria
12-14
Black Caddis
Chimarra spp
16-18
Slate Wing Mahogany
paraleptophlebia adoptiva
16-18
Early BWO's
(blue winged olives)
18-24
Green Rock Worm Caddis 10-18
Cranefly
10-14
Sulpher Dun
Ephemerella dorothea
16-18
Brown Drakes
Ephemera simulans
10-12
True Hendrikson
Ephemerella invaria
14-16
Light Hendrickson
Ephemerella rotunda
14-16
March Brown
Stenonenum vicarium
10-12
Summer Stonefly
Peridae, Perlodidae,
Chloroperlidae
4-16
Speckled Sedge
H. orealis
12-14
Hex
Hexagenia limbata
4-8
Cinnamon Sedge
Limnephilus spp
10-12
Mottled Sedge
Neophylax spp
10-12
Yellow-Brown Stone
Agnetina capitata
6-8
Trico
Tricorythodes spp
22-26
BWO's
(blue winged olives)
16-20
White Millers
Nectopsyche spp
12-14
Large Dun Variant
Hexagenia atrocaudata
6-8
Baetis (fall hatch)
Baetis spp
18-22

User comments
From: Clyde E. Pullen · cepullen·at·hotmail.com  Link
Submitted November 3rd 2007

Wow. What a great chart. Very helpful. Thanks.
In His Love,
Clyde



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