Oregon Hatch Chart
Which insects hatch on Oregon rivers each month, when they peak, and the flies to match.
- 10Hatches
- 1Hatching in November
- 12Watersheds
Hatching in November
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Blue-Winged OliveMayfly
CDC Dun #18–22
Oregon hatch calendar
Every hatch on the 12 watershed hatch charts of Oregon'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 | In season | Zebra Midge #22–26 | 34–65°F | ||||||||
| Blue-Winged Olive Mayfly Baetis sp. | In season | Peak | In season | In season | Peak | In season | CDC Dun #18–22 | 44–58°F | ||||||
| March Brown Mayfly Rhithrogena morrisoni | In season | Peak | In season | March Brown #12–14 | 52–62°F | |||||||||
| Skwala Stonefly Stonefly Skwala americana | Peak | In season | Skwala Adult #8 | 44–54°F | ||||||||||
| Pale Evening Dun Mayfly Heptagenia sp. | In season | Peak | In season | PED Comparadun #14–16 | 56–68°F | |||||||||
| Salmonfly Stonefly Pteronarcys californica | Peak | In season | Stimulator #4–6 | 50–60°F | ||||||||||
| Golden Stonefly Stonefly Hesperoperla pacifica | Peak | In season | Elk Hair Stone #6–8 | 55–65°F | ||||||||||
| Pale Morning Dun Mayfly Ephemerella inermis | In season | Peak | In season | Sparkle Dun #16–18 | 55–68°F | |||||||||
| Hopper Season Terrestrial Melanoplus sp. | In season | Peak | In season | Parachute Hopper #10 | 65–78°F | |||||||||
| October Caddis Caddis Dicosmoecus sp. | Peak | Peak | Orange Stimulator #8 | 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 Oregon
Oregon hatch FAQ
What are the main hatches in Oregon?
Midge, Blue-Winged Olive, March Brown, Skwala Stonefly, and Pale Evening Dun are on the most watershed hatch charts across Oregon's rivers.
When is the best hatch fishing in Oregon?
Mar, May–Jul, when 4 of the 10 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 12 watersheds Oregon'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.
