Midge
Midge
Chironomidae
- Season
- Dec–Mar
- Peak
- Feb
- Flies
- #22-26, Zebra Midge
- Water temp
- 34–65°F
Snake River Hatch Chart
Which insects hatch on the Snake each month, when they peak, and the flies to match.
- 10Hatches
- 1Hatching in November
Hatching in November
-
Blue-Winged OliveMayfly
#18-22, CDC Dun
Snake River hatch calendar
From the Salmon watershed hatch chart; timing on the Snake can run earlier or later.
| 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 | #22-26, Zebra Midge | 34–65°F | ||||||||
| Blue-Winged Olive Mayfly Baetis sp. | In season | Peak | In season | In season | Peak | In season | #18-22, CDC Dun | 44–58°F | ||||||
| March Brown Mayfly Rhithrogena morrisoni | In season | Peak | In season | #12-14, March Brown | 52–62°F | |||||||||
| Skwala Stonefly Stonefly Skwala americana | Peak | In season | #8, Skwala Adult | 44–54°F | ||||||||||
| Pale Evening Dun Mayfly Heptagenia sp. | In season | Peak | In season | #14-16, PED Comparadun | 56–68°F | |||||||||
| Salmonfly Stonefly Pteronarcys californica | Peak | In season | #4-6, Stimulator | 50–60°F | ||||||||||
| Golden Stonefly Stonefly Hesperoperla pacifica | Peak | In season | #6-8, Elk Hair Stone | 55–65°F | ||||||||||
| Pale Morning Dun Mayfly Ephemerella inermis | In season | Peak | In season | #16-18, Sparkle Dun | 55–68°F | |||||||||
| Hopper Season Terrestrial Melanoplus sp. | In season | Peak | In season | #10, Parachute Hopper | 65–78°F | |||||||||
| October Caddis Caddis Dicosmoecus sp. | Peak | Peak | #8, Orange Stimulator | 48–58°F |
- In season
- Peak
- This month
Key hatches
Blue-Winged Olive
Mayfly
Baetis sp.
- Season
- Mar–May, Sep–Nov
- Peak
- Apr, Oct
- Flies
- #18-22, CDC Dun
- Water temp
- 44–58°F
March Brown
Mayfly
Rhithrogena morrisoni
- Season
- Mar–May
- Peak
- Apr
- Flies
- #12-14, March Brown
- Water temp
- 52–62°F
Skwala Stonefly
Stonefly
Skwala americana
- Season
- Mar–Apr
- Peak
- Mar
- Flies
- #8, Skwala Adult
- Water temp
- 44–54°F
Pale Evening Dun
Mayfly
Heptagenia sp.
- Season
- May–Jul
- Peak
- Jun
- Flies
- #14-16, PED Comparadun
- Water temp
- 56–68°F
Salmonfly
Stonefly
Pteronarcys californica
- Season
- May–Jun
- Peak
- May
- Flies
- #4-6, Stimulator
- Water temp
- 50–60°F
Snake River hatch FAQ
What hatches are on the Snake?
10 hatches through the year, among them Midge, Blue-Winged Olive, March Brown, Skwala Stonefly, and Pale Evening Dun.
When do the hatches on the Snake peak?
The chart peaks Midge in Feb, Blue-Winged Olive in Apr, Oct, March Brown in Apr, and Skwala Stonefly in Mar.
Where does this hatch chart come from?
From the Salmon watershed hatch chart; timing on the Snake can run earlier or later. Check local reports before you go.
