Maryland Hatch Chart
Which insects hatch on Maryland rivers each month, when they peak, and the flies to match.
- 19Hatches
- 3Hatching in November
- 5Watersheds
Hatching in November
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Blue-Winged OliveMayfly
Sparkle Dun #18–22, Parachute Adams #18–22
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Autumn CaddisCaddis
October Caddis #14
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Autumn SedgeCaddis
October Caddis #14
Maryland hatch calendar
Every hatch on the 5 watershed hatch charts of Maryland'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 | In season | Sparkle Dun #18–22, Parachute Adams #18–22 | 44–58°F | ||||||||
| Quill Gordon Mayfly Epeorus pleuralis | Peak | In season | 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 | |||||||||
| 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 | Peak | In season | In season | Light Cahill #14 | 58–70°F | |||||||||
| Sulphur Mayfly Ephemerella dorothea | In season | Peak | In season | Parachute Sulphur #16–18 | 55–68°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 | 60–72°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 |
- 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 Maryland
Maryland hatch FAQ
What are the main hatches in Maryland?
Blue-Winged Olive, Quill Gordon, Light Cahill, Trico, and Winter Midge are on the most watershed hatch charts across Maryland's rivers.
When is the best hatch fishing in Maryland?
May, when 9 of the 19 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 5 watersheds Maryland'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.
