What's hatching in the Midwest in August

53 fly patterns are active in the Midwest in August. Here's what to tie on — with sizes and full recipes.

Match the hatch live →

August hatches — Midwest

Light Cahill (Nymph)

Nymph · #12, #14, #16 · imitates Maccaffertium vicarium

Light Cahill (Dun)

Dun · #12, #14, #16 · imitates Maccaffertium vicarium

Light Cahill (Spinner)

Spinner · #12, #14, #16 · imitates Maccaffertium vicarium

Western Trico (Nymph)

Nymph · #22, #24, #26 · imitates Tricorythodes

Western Trico (Dun)

Dun · #22, #24, #26 · imitates Tricorythodes

Western Trico (Spinner)

Spinner · #22, #24, #26 · imitates Tricorythodes

Isonychia (Slate Drake) (Nymph)

Nymph · #10, #12 · imitates Isonychia bicolor

Isonychia (Slate Drake) (Dun)

Dun · #10, #12 · imitates Isonychia bicolor

Isonychia (Slate Drake) (Spinner)

Spinner · #10, #12 · imitates Isonychia bicolor

Tan Elk Hair Caddis (Nymph)

Nymph · #14, #16, #18 · imitates Hydropsyche

Olive Elk Hair Caddis (Nymph)

Nymph · #14, #16, #18 · imitates Hydropsyche

Black Elk Hair Caddis (Nymph)

Nymph · #14, #16, #18 · imitates Hydropsyche

Tan Elk Hair Caddis (Emerger)

Emerger · #14, #16, #18 · imitates Hydropsyche

Olive Elk Hair Caddis (Emerger)

Emerger · #14, #16, #18 · imitates Hydropsyche

Black Elk Hair Caddis (Emerger)

Emerger · #14, #16, #18 · imitates Hydropsyche

Tan Elk Hair Caddis (Dun)

Dun · #14, #16, #18 · imitates Hydropsyche

Olive Elk Hair Caddis (Dun)

Dun · #14, #16, #18 · imitates Hydropsyche

Black Elk Hair Caddis (Dun)

Dun · #14, #16, #18 · imitates Hydropsyche

Cinnamon Caddis (Nymph)

Nymph · #14, #16, #18 · imitates Cheumatopsyche

Cinnamon Caddis (Emerger)

Emerger · #14, #16, #18 · imitates Cheumatopsyche

Cinnamon Caddis (Dun)

Dun · #14, #16, #18 · imitates Cheumatopsyche

Red Zebra Midge (Nymph)

Nymph · #18, #20, #22 · imitates Chironomidae

Black Zebra Midge (Nymph)

Nymph · #18, #20, #22 · imitates Chironomidae

Olive Zebra Midge (Nymph)

Nymph · #18, #20, #22 · imitates Chironomidae

Cream Zebra Midge (Nymph)

Nymph · #18, #20, #22 · imitates Chironomidae

Red Zebra Midge (Emerger)

Emerger · #18, #20, #22 · imitates Chironomidae

Black Zebra Midge (Emerger)

Emerger · #18, #20, #22 · imitates Chironomidae

Olive Zebra Midge (Emerger)

Emerger · #18, #20, #22 · imitates Chironomidae

Cream Zebra Midge (Emerger)

Emerger · #18, #20, #22 · imitates Chironomidae

Red San Juan Worm (Nymph)

Nymph · #12, #14 · imitates Annelida

Pink San Juan Worm (Nymph)

Nymph · #12, #14 · imitates Annelida

Squirmy-Orange San Juan Worm (Nymph)

Nymph · #12, #14 · imitates Annelida

Prince Nymph (Nymph)

Nymph · #12, #14, #16 · imitates Attractor Nymph

Beadhead Prince Nymph (Nymph)

Nymph · #12, #14, #16 · imitates Attractor Nymph

Black Ant (Terrestrial)

Terrestrial · #14, #16, #18 · imitates Formicidae

Cinnamon Black Ant (Terrestrial)

Terrestrial · #14, #16, #18 · imitates Formicidae

Grasshopper (Terrestrial)

Terrestrial · #8, #10, #12 · imitates Orthoptera

Yellow Grasshopper (Terrestrial)

Terrestrial · #8, #10, #12 · imitates Orthoptera

Beetle (Terrestrial)

Terrestrial · #12, #14, #16 · imitates Coleoptera

Black Woolly Bugger (Streamer)

Streamer · #4, #6, #8, #10 · imitates Leech / Baitfish attractor

Olive Woolly Bugger (Streamer)

Streamer · #4, #6, #8, #10 · imitates Leech / Baitfish attractor

White Woolly Bugger (Streamer)

Streamer · #4, #6, #8, #10 · imitates Leech / Baitfish attractor

Mahogany Dun (Nymph)

Nymph · #14, #16 · imitates Paraleptophlebia adoptiva / heteronea

Mahogany Dun (Dun)

Dun · #14, #16 · imitates Paraleptophlebia adoptiva / heteronea

Mahogany Dun (Spinner)

Spinner · #14, #16 · imitates Paraleptophlebia adoptiva / heteronea

Pale Evening Dun (Nymph)

Nymph · #14, #16 · imitates Heptagenia elegantula

Pale Evening Dun (Dun)

Dun · #14, #16 · imitates Heptagenia elegantula

Pale Evening Dun (Spinner)

Spinner · #14, #16 · imitates Heptagenia elegantula

Green Caddis Larva (Nymph)

Nymph · #12, #14, #16 · imitates Rhyacophila

Green Caddis Pupa (Emerger)

Emerger · #12, #14, #16 · imitates Rhyacophila

Cranefly Adult (Terrestrial)

Terrestrial · #8, #10, #12 · imitates Tipula

Cranefly Larva (Nymph)

Nymph · #8, #10, #12 · imitates Tipula

Flying Ant (Terrestrial)

Terrestrial · #16, #18, #20 · imitates Camponotus / Lasius

Other months in the Midwest

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

August in other regions