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Insect Hatch Charts: Top 10 US Rivers

Beaver Kill River

Eastern New York

Brown Trout, Rainbow Trout & Brook Trout. Public Fishing Rights on the Beaver Kill (PDF).  

Fly NameDates of Hatch
Blue Wing OliveApril 1 – May 9
Blue Wing OliveJuly 15 – September 30
HendricksonApril 20 – May 20
Green CaddisMay 1 – May 20
Pale Evening DunMay 15 – June 20
Grey FoxMay 10 – June 20
Green DrakeMay 15 – June 15
TricoJuly 15 – September 30

Batten Kill River

Eastern New York & Vermont

Brown Trout. Public Fishing Rights on the Batten Kill (PDF).  

Fly NameDates of Hatch
Blue Winged OliveMay 25 – August 25
HendricksonApril 20 – May 20
Blue Winged OliveJuly 25 – October 31
Pale Evening DunMay 15 – June 20
Yellow QuillJune 2 – June 25
Cream VariantJune 20 – August 10
TricoJuly 15 – September 14

Au Sable River

North Western Michigan

Brown Trout, Rainbow Trout. Public Fishing Rights on the Au Sable (PDF).  

Fly NameDates of Hatch
Black CaddisApril 15 – June 15
HendricksonApril 20 – May 20
Brown DrakeJune 1 – July 10
Pale Evening DunMay 15 – July 5
Giant MayflyJune 15 – July 10
TricoJuly 15 – September 15

Letort River

Southern Pennsylvania

Brown Trout. More about the Letort Spring Run Conservation Project (webpage).

Fly NameDates of Hatch
Blue-Winged OliveApril 1 – May 10
Pale Evening DunMay 1 – June 10
TricoJuly 1 – October 31
Blue-Winged OliveSeptember 20 – October 31
TerrestrialsJuly 1 – September 30
Scuds, CressbugsJan 1 – Dec 31

Yellowstone River

North Western Wyoming

Brook Trout, Brown Trout, Lake Trout, Rainbow Trout, plus native Cutthroat Trout and Grayling. NOTE: there are a number of active conservation regulations, we strongly recommend you read the official Yellowstone Fishing Guide and Regulations with maps (webpage)

Fly NameDates of Hatch
Blue Winged OliveApril 20 – June 10
Black CaddisMay 1 – May 30
Caddis (various)May 1 – May 30
SalmonflyJune 15 – July 15
Mahogany DunSeptember 1 – September 20
Blue Winged OliveAugust 15 – September 30
TerrestrialsAugust 1 – September 15

Madison River

Montana / Wyoming border

Official Montana State Fishing Guide (web) and North West Wyoming Public Fishing Maps (PDF).

Fly NameDates of Hatch
Grannom CaddisApril 15 – May 30
Pale Morning DunMay 20 – July 20
Caddis (various)June 1 – July 30
SalmonflyJune 20 – July 20
Blue Wing OliveApril 10 – May 10
Sm Blue-Wing OliveSeptember 1 – October 31
TerrestrialsAugust 1 – September 15

Green River

North Eastern Utah

Brown & Rainbow Trout, Mountain Whitefish. Official Green River Fishing Guide (interactive).

Fly NameDates of Hatch
Blue Winged OliveMarch 1 – May 30
Blue Winged OliveOctober 1 – Dec 31
Midges, Scuds etcJan 1 – Dec 31
Pale Morning DunMay 20 – July 30
Caddis (various)May 20 – August 20
TerrestrialsMay 20 – Dec 15
CicadaJune 1 – October 31

San Juan River

Central New Mexico

Trout. Official New Mexico Fishing Guide (webpage).

Fly NameDates of Hatch
Blue Wing OliveMarch 1 – October 31
Grey CaddisMay 1 – June 30
MidgesJan 1 – Dec 31
Pale Morning DunJuly 10 – September15
Terrestrialsugust 1 – August 30

Deschutes River

Northern Oregon

Steelhead, Redband Trout, Whitefish. Official Oregon Fishing Guide (webpage).

Fly NameDates of Hatch
Blue Wing OliveMarch 1 – April 30
Blue Wing OliveSeptember 15 – October 31
Pale Morning DunMay 15 – July 30
SalmonflyMay 1 – May 30
Caddis (various)May 1 – July 30
TricoJuly 15 – October 31
October CaddisSeptember 15 – October 31

Hat Creek

Western California

Trout. Sierra Business Council guide to Hat Creek (webpage).

Fly NameDates of Hatch
Blue Winged OliveMay 25 – August 25
Pale Morning DunMay 1 – June 30
Pale Evening DunJune 1 – July 30
Green DrakeMay 1 – June 30
TricoJune 1 – October 31
October CaddisJune 1 – July 30
October CaddisOctober 1 – October 31
SalmonflyApril 1 – May 30
Golden StoneflyApril 1 – May 30

Please Note:

Public access rights, public fishing rights, licensing and other regulations will vary from location to location.

Wherever possible we’ve linked to official information from the relevant authorities as a starting point for you to conduct your own research, but we cannot take responsibility for the accuracy of information on other websites.

To ensure you enjoy your trip to the full, always check the current situation with regard to your rights and your responsibilities before setting off.

Happy angling! 

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