When does the Pale Morning Dun hatch?

The Pale Morning Dun typically runs for 6 weeks. Peak emergence occurs in the morning.

What water temperature triggers the Pale Morning Dun hatch?

The Pale Morning Dun hatches when water temperature is between 55°F and 68°F, with peak activity around 60°F.

PMD Parachute #16-18, PMD Comparadun #16, Rusty Spinner #16-18, Pheasant Tail #16.

Hatch profile

Ephemerella excrucians

MayflyMorning

Water-temperature trigger

30°F55–68°Fpeak 60°F80°F

Top fly patterns

More reliable on tailwaters where stable temps suit the hatch. Often runs concurrently with Sulphurs but emerges in morning rather than evening.

Other rivers with Pale Morning Dun activity

Bield Fish watches USGS water-temp gauges for your home water and pings you when conditions hit the 55–68°F trigger window.