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
Most-active hatches across Pennsylvania's 10 covered rivers right now. Tap a hatch for the full species profile.
Rivers
- Clinton CountyBig Fishing CreekFreestoneHendricksonSulphurGreen Drake
- Monroe CountyBrodhead CreekFreestoneHendricksonSulphurSlate Drake
- Franklin CountyFalling Springs BranchSpring CreekTricoSulphurTerrestrials
- Cumberland CountyLetort Spring RunSpring CreekSulphurTricoTerrestrials
- Blair County · Huntingdon CountyLittle Juniata RiverLimestoneSulphurGreen DrakeTrico
- Lycoming County · Sullivan CountyLoyalsock CreekFreestoneHendricksonSulphurSlate Drake
- Centre County · Union CountyPenns CreekLimestoneGreen DrakeSulphurBWO
- Centre CountySpring CreekLimestoneSulphurTricoBWO
- Wayne County · Pike CountyUpper Delaware RiverTailwaterGreen DrakeSulphurSlate Drake
- Cumberland CountyYellow Breeches CreekLimestoneSulphurTricoBWO