Catskill, NY Hatch Chart

Yellow boxes indicate the possibility of early hatching due to lower water and warmer temperatures, especially in the early season.  In the late season, for example, BWO's may be delayed due to warm/low water.

Green boxes indicates the typical hatch period

Blue boxes indicate the possibility of hatches in the early season lasting longer due to colder/higher water and late season hatches ending earlier then normal.

Common Name

Scientific Name

Size(s)

March

April

May

June

July

Aug

Sept

Oct

Nov

Blue Winged Olive

Baetis Vagans

16 - 20

Blue Quill

Paraleptophlebia Adoptiva

16 - 18

Quill Gordan

Epeorus Pleuralis

12 - 14

Hendrickson

Ephemerella Subvaria (F)

12 - 14

Red Quill

Ephemerella Subvaria (M)

12 - 14

Hendrickson X

Ephemeralla X

14 - 16

March Brown

Stenonema Vicarium

10-2x - 10

Sulphur

Ephemerella Invaria

14 - 16

Gray Fox

Stenonema Fuscum

10 - 14

Green Drake

Ephemera Guttulata

8 - 10 2x

Brown Drake

Ephemera Simulans

10 - 12 2x

Slate Drake, Iso

Isonychia Bicolor

10-2x - 14

Sulphur

Ephemerella Dorthea

16 - 20

Blue Winged Olive

Coronuta

14 - 16

Light Cahill

Stenonema Ithaca

12 - 16

Yellow Drake

Ephemera Varia

8 - 10 2x

Golden Drake

Potamanthus Distinctus

10-2x - 10

Trico

Tricorythodes

18 - 24

White Fly

Ephoron Leukon

10 - 12

Late Sulphur (Hebe)

Heptagenia Hebe

16 - 20

Blue Winged Olives

Various Species

16 - 24