Hatch chart
What usually hatches each month on eastern freestone rivers, with matching fly sizes.
Eastern freestone rivers: typical hatch months
| Insect and hook size | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blue-winged olive hook #18–22 | hatching | hatching | hatching | hatching | hatching | hatching | ||||||
| Hendrickson hook #12–14 | hatching | hatching | ||||||||||
| March brown hook #10–12 | hatching | hatching | ||||||||||
| Sulphur hook #14–18 | hatching | hatching | hatching | |||||||||
| Caddis (various) hook #14–18 | hatching | hatching | hatching | hatching | hatching | hatching | ||||||
| Isonychia hook #10–12 | hatching | hatching | hatching | hatching | ||||||||
| Trico hook #20–24 | hatching | hatching | hatching | |||||||||
| Midges hook #20–26 | hatching | hatching | hatching | hatching | hatching |
General timing; hatches shift with water temperature, elevation and the season's weather.
How this tool works
General timing for eastern freestone rivers. Hatches shift with water temperature, elevation and the year's weather; a river's own chart from a local fly shop beats any general chart.