Pennsylvania Hatch Chart
Which insects hatch on Pennsylvania rivers each month, when they peak, and the flies to match.
- 26Hatches
- 4Hatching in November
- 10Watersheds
Hatching in November
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Blue-Winged OliveMayfly
Sparkle Dun #18–22, Parachute Adams #18–22, CDC Emerger #18–22
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Autumn CaddisCaddis
October Caddis #14
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Autumn SedgeCaddis
October Caddis #14
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Fall BWOOther
Sparkle Dun #18–20
Pennsylvania hatch calendar
Every hatch on the 10 watershed hatch charts of Pennsylvania's rivers, month by month.
| Hatch | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Flies | Water temp |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Little Black Stonefly Stonefly Capnia sp. | In season | Peak | In season | Elk Hair Caddis #18 | 38–50°F | |||||||||
| Winter Midge Midge Chironomidae | Peak | Peak | In season | In season | Zebra Midge #20–26 | 34–50°F | ||||||||
| Little Black Caddis Caddis Chimarra sp. | In season | Peak | In season | Soft Hackle #18 | 46–56°F | |||||||||
| Blue-Winged Olive Mayfly Baetis tricaudatus | In season | Peak | Peak | Peak | Peak | In season | Sparkle Dun #18–22, Parachute Adams #18–22, CDC Emerger #18–22 | 44–58°F | ||||||
| Early Black Stonefly Stonefly Allocapnia sp. | Peak | In season | Black Elk Hair #16–18 | 36–50°F | ||||||||||
| Quill Gordon Mayfly Epeorus pleuralis | In season | Peak | Quill Gordon #12–14 | 48–56°F | ||||||||||
| American March Brown Other Maccaffertium vicarium | Peak | In season | March Brown #10–12 | 52–62°F | ||||||||||
| Grannom Caddis Caddis Brachycentrus numerosus | In season | Peak | Elk Hair Caddis #14–16 | 48–58°F | ||||||||||
| Hendrickson Mayfly Ephemerella subvaria | Peak | In season | Comparadun #12–14 | 48–58°F | ||||||||||
| March Brown Mayfly Stenonema vicarium | In season | Peak | In season | March Brown #10–12 | 52–62°F | |||||||||
| Yellow Sally Stonefly Isoperla sp. | In season | Peak | In season | Yellow Sally #14–16 | 52–64°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 | ||||||||||
| Green Drake Mayfly Ephemera guttulata | Peak | Peak | Green Drake Wulff #8–10 | 55–65°F | ||||||||||
| Green Sedge Caddis Rhyacophila sp. | In season | Peak | In season | Green Caddis #12–14 | 55–66°F | |||||||||
| Light Cahill Mayfly Stenacron interpunctatum | In season | Peak | In season | Light Cahill #14 | 58–70°F | |||||||||
| Sulphur Mayfly Ephemerella dorothea | In season | Peak | In season | Parachute Sulphur #16–18 | 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 | |||||||||
| Terrestrials Other Ants · Beetles | In season | Peak | In season | Fur Ant #14–18 | 62–78°F | |||||||||
| Trico Mayfly Tricorythodes sp. | In season | Peak | In season | Trico Spinner #22–26, Trico Poly Wing #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 | |||||||||
| Autumn Caddis Caddis Neophylax sp. | In season | Peak | In season | October Caddis #14 | 48–58°F | |||||||||
| Autumn Sedge Caddis Neophylax sp. | In season | Peak | In season | October Caddis #14 | 48–58°F | |||||||||
| Fall BWO Other Baetis sp. | In season | Peak | In season | Sparkle Dun #18–20 | 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 Pennsylvania
Pennsylvania hatch FAQ
What are the main hatches in Pennsylvania?
Blue-Winged Olive, Trico, Quill Gordon, Light Cahill, and Hendrickson are on the most watershed hatch charts across Pennsylvania's rivers.
When is the best hatch fishing in Pennsylvania?
May, when 12 of the 26 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 Pennsylvania'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.
