Southern Ontario Hatch Chart

Mayflies

Hendrickson
Genus: Ephemerella subvaria
Hatch Period: late April - early May
Hatch Time: afternoon
Hook Size: 12-16
Early Blue-Winged Olive
Genus: Baetis spp.
Hatch Period: mid May - late May
Hatch Time: midday
Hook Size: 16-18
Early Blue-Winged Olive
Pale Evening Dun
Genus: Ephemerella dorothea
Hatch Period: late May - early June
Hatch Time: evening
Hook Size: 18
Pale Evening Dun
Green Drake
Genus: Ephemera guttulata
Hatch Period: late May - early June
Hatch Time: dusk
Hook Size: 8-10
Green Drake
Brown Drake
Genus: Ephemera simulans
Hatch Period: late May - early June
Hatch Time: evening
Hook Size: 8-10
Brown Drake
Mahogany Dun
Genus: Isonychia sp.
Hatch Period: early June - late September
Hatch Time: evening
Hook Size: 10
>Mahogany Dun
Light Cahill
Genus: Stenacron sp.
Hatch Period: mid June - late September
Hatch Time: evening
Hook Size: 14-16
Light Cahill
White-Winged Black
Genus: Tricorythodes sp.
Hatch Period: early July - late July
Hatch Time: early morning
Hook Size: 20-22
White-Winged Black
White Fly
Genus: Ephoron leukon
Hatch Period: mid August - mid September
Hatch Time: evening
Hook Size: 14
White Fly
Blue Winged Olive
Genus: Pseudocloeon sp.
Hatch Period: late August - mid September
Hatch Time: throughout the day
Hook Size: 22
Blue Winged Olive

Caddis

Spotted Sedge
Genus: Hydropsyche sp.
Hatch Period: early May - late August
Hatch Time: afternoon
Hook Size: 12-14
Spotted Sedge
Little Black Caddis
Genus: Chimarra
Hatch Period: late May - early June
Hatch Time: morning
Hook Size: 18-20
Little Black Caddis
Great Orange Sedge
Genus: Pycnopsyche spp.
Hatch Period: early - late September
Hatch Time: morning
Hook Size: 10
Great Orange Sedge

Stoneflys

Early Black Stonefly
Genus: Allocapnia sp.
Hatch Period: early April - early May
Hatch Time: midday
Hook Size: 16-18
Early Black Stonefly
Golden Stonefly
Genus: Paragentina media
Hatch Period: early June - mid July
Hatch Time: after dark
Hook Size: 8-10
Golden Stonefly

Book a Guided Fly Fishing Trip with Grindstone Angling

Contact us today to inquire about a guided trip on any of the great rivers in Ontario. You can call the shop at 905-689-0880 or using our guide trip inquiry form below. You can find out more about our services on our Ontario Fishing Guide Service page.

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