Pennsylvania Hatch Chart
This is a brief list of the many thousands of hatches that are found across Pennsylvania. All dates and time are approximations. Sun, clouds, rain, and temperatures can have a wide range of effects on the timing of all hatches. The first occurrence of most hatches generally start in the southern part of the state and then work there way north.
| Hatch Common Name |
Hook Size |
Start Date |
Start time |
Latin Name |
| Little Blue Winged Olive |
16-20 |
15-Mar |
10:00 AM - 4:00 PM |
Ephemerella & Baetis |
| Blue Quill |
16-18 |
17-Apr |
11:30 AM - 3:00 PM |
Paraleptophlebia adoptiva |
| Quill Gordon |
12-14 |
17-Apr |
1:30 PM - 6:30 PM |
Epeorus pleuralis |
| Hendrickson Female |
12 |
19-Apr |
2:00 PM - 6:30 PM |
Ephemerella subvaria |
| Red Quill Male |
14 |
19-Apr |
2:00 PM - 6:30 PM |
Ephemerella subvaria |
| Sulphurs |
14-16 |
10-May |
7:00 PM |
Ephemerella rotunda, dorthea, & others |
| March Brown |
10-12 |
12-May |
All Day |
Stenonema vicarium |
| Gray Fox |
10-12 |
12-May |
10:00AM - Noon |
Stenonema fuscum |
| Light Cahill |
14 |
18-May |
8:00 PM |
Stenacron |
| Blue Winged Olive |
14-18 |
20-May |
10:00 AM - 3:00 PM |
Baetidae |
| Green Drake |
8-10 |
24-May |
8:00 PM |
Ephemera guttulata |
| Brown Drake |
10-14 |
26-May |
8:00 PM |
Ephemera simulans |
| Slate Drake |
12-14 |
26-May |
5:00 PM |
Isonychia bicolor & sadleri |
| Trico |
20-24 |
15-Jul |
7:00 AM -Noon |
Tricorythodes stygiatus |
| White Fly |
10-14 |
Early August |
7:30 PM |
Ephoron lekon |
| Slate Drake |
12-14 |
August-October |
Noon - 4:00 PM |
Isonychia |