Hatch calendars by river
Pennsylvania trout hatch calendars.
10 rivers covered. Each calendar runs through the full year of mayfly, caddis, stonefly, midge, and terrestrial activity — with peak windows, fly patterns, and water temperature triggers.
What's hatching in Pennsylvania — May
Rivers
Pennsylvania hatch waters.
Centre County · Union County
Penns Creek
Limestone · brown_trout / wild
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Centre County
Spring Creek
Limestone · brown_trout / wild
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Monroe County
Brodhead Creek
Freestone · brown_trout / rainbow_trout
Notable hatches
Midge · Blue Winged Olive · Quill Gordon
Cumberland County
Letort Spring Run
Spring creek · brown_trout / wild
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Cumberland County
Yellow Breeches Creek
Limestone · brown_trout / rainbow_trout
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Clinton County
Big Fishing Creek
Freestone · brown_trout / wild
Notable hatches
Midge · Blue Winged Olive · Quill Gordon
Lycoming County · Sullivan County
Loyalsock Creek
Freestone · brown_trout / wild
Notable hatches
Midge · Blue Winged Olive · Quill Gordon
Franklin County
Falling Springs Branch
Spring creek · brown_trout / rainbow_trout
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Blair County · Huntingdon County
Little Juniata River
Limestone · brown_trout / wild
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Wayne County · Pike County
Upper Delaware River
Tailwater · brown_trout / rainbow_trout
Notable hatches
Midge · Blue Winged Olive · Hendrickson
Live water temp + hatch alerts.
Bield Fish reads USGS gauges and surfaces hatch alerts as water hits the trigger window.