Northern Wisconsin Trout Stream Mayfly Hatch Chart
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Below are listed the most common Wisconsin mayfly hatches I have fished over
the years. This is mainly the northwest Wisconsin and central Wisconsin trout
streams (such as the Namekagon River, Bois Brule, White River, Prairie, Wolf, Phestigo,
Pine and more).
The X's represent individual weeks within a given month and the approximate
emergence time for each mayfly. The hatch dates will vary from year to year
depending on the weather conditions, seasonal climate changes, type of stream
and depending where the trout stream is located within Wisconsin.
Click here for Mobile phone Wisconsin mayfly hatch chart.
Northern Wisconsin Trout Stream Mayfly Hatches
| Common Name |
Scientific Name / Details |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
| Blue Wing Olives (BWO)(2) |
Baetis
size:6-7mm (#18 -#22)
nymphs 3 tails (middle tail shorter)
duns 2 tails |
--XX |
XXXX |
XXXX |
XXXX |
|
|
XXXX |
| Gray Drake |
Siphloplecton basale
size: 14-16 mm (#8)
nymphs 3 tails / duns 2 tails
|
|
--X |
X-- |
|
|
|
|
| Hendrickson |
Ephemerella subvaria
size: 10-12 mm (#12)
nymphs 3 tails / duns 3 tails
|
|
--XX |
XX-- |
|
|
|
|
| Sulphurs |
Ephemerella invaria / rotunda / excrucians
size: 9-10 mm (#14)
nymphs 3 tails / duns 3 tails
|
|
|
--XX |
X--- |
|
|
|
| Sulphurs |
Ephemerella dorothea
size: 6-7 mm (#18)
nymphs 3 tails / duns 3 tails |
|
|
--XX |
XX--- |
|
|
|
| Gray Drake |
Siphlonurus alternatus
size 12 -16 mm (#8)
nymphs 3 tails
duns / spinners 2 tails
|
|
|
--XX |
XX--- |
|
|
|
| Little Dark Hendrickson |
Ephemerella needhami
size: 9-10 mm
(#14)
nymphs 3 tails / duns 3 tails
|
|
|
---X |
XX- |
|
|
|
| Sulphur |
Epeorus vitreus
size 9 - 12 mm
nymphs 2 tails / duns 2 tails
|
|
|
---X |
XX- |
|
|
|
| March Brown / Gray Fox |
Maccaffertium vicarium
(formerly Stenonema)
size 14-16 mm (#10 2x long)
nymphs 3 tails (clingers)
duns 2 tails (speckled wings)
|
|
|
---X |
XXX- |
|
|
|
| Armored Speckled-Wing |
Baetisca laurentina
size 10-12 mm (#12)
nymphs 3 tails (fat body)
duns 2 tails (chubby mottled wing) |
|
|
---X |
XXX- |
|
|
|
| Light
Cahill |
Stenacron / Maccaffertium
(several species)
size 9-1 mm (#12 2x long)
nymphs 3 tails (clingers)
duns 2 tails (speckled wings) |
|
|
|
XXX- |
|
|
|
| Darth Vader |
Serratella deficiens
size: 4-5 mm (#20)
Blackish wings
pale yellow legs
nymphs 3 tails
/ duns 3 tails |
|
|
|
XXX- |
|
|
|
| Brown
Drake(1) |
Ephemera simulans
size 12-15 mm (#10 2x long)
nymphs 3 tails (burrower)
duns 3 tails (brown splotch wing) |
|
|
|
XXX- |
|
|
|
Hex Hatch
Michigan Caddis(1) |
Hexagenia limbata
size 16-35 mm (#6)
nymphs 3 tails (burrower)
duns 3 tails |
|
|
|
--XX |
X--- |
|
|
| Mahogany Dun |
Isonychia bicolor
size 13-16 mm (#8 2x long)
nymphs 3 tails (swimmers)
duns 2 tails |
|
|
|
---X |
XXXX |
XX-- |
|
| Tricos |
Tricorythodes minutus
3 -3 1/2 mm (#22)
nymphs 3 tails
duns 3 tails (blackish body) |
|
|
|
|
-XXX |
|
|
| Large Rusty Spinner(1) |
Hexagenia atrocaudata
size 16-30 mm (#6)
nymphs 3 tails (burrower)
duns 3 tails
|
|
|
|
|
--XX |
X--- |
|
| Little Yellow Quill |
Leucrocuta hebe
size 9-12 mm (#12)
duns 2 tails
duns yellow body & orange thorax |
|
|
|
|
---X |
XXX- |
|
| White Fly(1) |
Ephoron leukon
size 10-13 mm (#12)
nymphs 3 tails (burrowers)
duns 2 tails (white body) |
|
|
|
|
|
XXX- |
|
| Common Name |
Scientific Name / Details |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Notes:
(1) - indicates mayfly nymphs that burrow in sand, silt and muck. The densest
hatches for these insects will occur in those stretches of the stream.
(2) - there are several mayflies species that all fall under Blue Wing Olives
(BWO) and hatch at different times during the season. Some I see are too sporatic
to really get the trout's attention.
Northern Wisconsin Trout Stream Caddis Hatches (Sedge)
I don't know the scientific names for most of the dominant caddisfly hatches, but do not under-estimate the importance of these little fluttering critters. On many of the Wisconsin freestone streams that I frequently fly fish for trout there are numerous caddisfly hatches that trigger heavy trout feeding. Some of my favorite caddisfly hatches are the Grannom (Brachycentrus), Green Sedge (Rhyacophilia), Dark Green Sedge (?), Little Black Sedge (Chimarra), Spotted Sedge (Hydropsyche), Ginger Sedge (?) and Great Brown Sedge (Pycnopsyche). You can find caddis on the rivers pretty much all summer long from East Coast to the West Coast. I prefer tightly wrapped wool for the larva stage, Gary LaFontaine's Emergent Sparkle Pupa or a small bead head, gold-ribbed hare's ear for the emerging caddis, and elk hair caddis, or diving bead head caddis for the adults. See the Caddisfly page for more information.
Paged Reviewed: Wisconsin mayfly hatch chart | Wisconsin hatch chart
Reviewed By: Joe Hawkins
Page Rating: 5.0
Review Date: 16 May 2012
Page Review:
This is great mayfly hatch chart!! Thank you WiFlyfisher!
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