Minnesota Hatch Chart
Which insects hatch on Minnesota rivers each month, when they peak, and the flies to match.
- 18Hatches
- 3Hatching in November
- 10Watersheds
Hatching in November
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Midge PeakMidge
Griffith's Gnat #22–26
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Blue-Winged OliveMayfly
CDC Emerger #18–22, Sparkle Dun #18–22
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Fall BWOOther
Sparkle Dun #18–20, CDC Emerger #18–22
Minnesota hatch calendar
Every hatch on the 10 watershed hatch charts of Minnesota's rivers, month by month.
| Hatch | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Flies | Water temp |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Midge Midge Chironomidae | In season | Peak | In season | Peak | In season | Griffith's Gnat #22–26 | 34–65°F | |||||||
| Little Black Stonefly Stonefly Capnia sp. | In season | Peak | Black Elk Hair #18 | 38–50°F | ||||||||||
| Blue-Winged Olive Mayfly Baetis tricaudatus | In season | In season | Peak | Peak | In season | In season | CDC Emerger #18–22, Sparkle Dun #18–22 | 44–58°F | ||||||
| Early Black Stonefly Stonefly Allocapnia sp. | Peak | In season | Black Elk Hair #16–18 | 36–50°F | ||||||||||
| Hendrickson Mayfly Ephemerella subvaria | In season | Peak | Comparadun #12–14 | 48–58°F | ||||||||||
| Little Black Caddis Caddis Chimarra sp. | Peak | In season | X-Caddis #18 | 46–56°F | ||||||||||
| Brown Drake Mayfly Ephemera simulans | In season | Peak | Brown Drake #10–12 | 55–65°F | ||||||||||
| Grannom Caddis Brachycentrus numerosus | Peak | In season | Elk Hair Caddis #14–16 | 48–58°F | ||||||||||
| Sulphur / PMD Other Ephemerella dorothea | In season | Peak | In season | Parachute Adams #16–18 | 55–68°F | |||||||||
| Tan Caddis Caddis Hydropsyche sp. | In season | Peak | In season | In season | Elk Hair Caddis #14–16 | 55–68°F | ||||||||
| Hex / Giant Mayfly Mayfly Hexagenia limbata | Peak | In season | Hex Paradrake #4–6 | 62–72°F | ||||||||||
| Michigan Caddis Caddis Hydropsyche sp. | In season | Peak | In season | Sparkle Pupa #14 | 58–70°F | |||||||||
| Sulphur Mayfly Ephemerella dorothea | Peak | In season | Parachute Sulphur #16–18 | 55–68°F | ||||||||||
| Terrestrials Other Ants · Beetles · Hoppers | In season | Peak | In season | Chernobyl Ant #10–18 | 62–78°F | |||||||||
| Trico Mayfly Tricorythodes sp. | In season | Peak | In season | Trico Poly Wing #22–26, Trico Spinner #22–26 | 60–72°F | |||||||||
| Flying Ant Terrestrial Camponotus sp. | Peak | In season | Fur Ant #16–18 | 64–76°F | ||||||||||
| Isonychia Mayfly Isonychia bicolor | In season | Peak | In season | Slate Drake #10–12 | 58–68°F | |||||||||
| Fall BWO Other Baetis sp. | In season | Peak | In season | Sparkle Dun #18–20, CDC Emerger #18–22 | 44–56°F |
- In season
- Peak
- This month
A month is marked when any of the watershed charts lists the hatch, and as a peak when most of them peak then. Smaller streams often see lighter or later hatches.
River hatch charts in Minnesota
Minnesota hatch FAQ
What are the main hatches in Minnesota?
Blue-Winged Olive, Hendrickson, Brown Drake, Trico, and Fall BWO are on the most watershed hatch charts across Minnesota's rivers.
When is the best hatch fishing in Minnesota?
May–Jul, when 7 of the 18 hatches on the chart are on the water. Check local reports: weather moves every hatch.
Where does this hatch chart come from?
From the hatch charts of the 10 watersheds Minnesota's rivers run through. A month is marked when any of them lists the hatch, and as a peak when most of them peak then.
