Question 1

When does the Hendrickson hatch occur?

Accepted Answer

The Hendrickson (Ephemerella subvaria) hatch runs from April through June across Eastern US rivers, with peak activity typically in April or May. Earlier on lower-elevation southern rivers, later on northern and high-elevation streams.

Question 2

What flies match the Hendrickson hatch?

Accepted Answer

Standard Hendrickson fly patterns include Hendrickson Parachute #12-14, Red Quill Spinner #12-14, Pheasant Tail Nymph #14, Hendrickson Comparadun #14. First substantial mayfly hatch on most Eastern rivers. Spinner falls in evening can be as productive as the dun emergence.

Question 3

What water temperature triggers the Hendrickson hatch?

Accepted Answer

Hendrickson emergence triggers at water temperatures of 50–58°F, with peak activity around 55°F. Read your thermometer, not your calendar.

Question 4

What time of day does the Hendrickson hatch?

Accepted Answer

The Hendrickson hatch typically emerges in the afternoon. Plan your fishing window around that — being on the water before the emergence starts is more important than being on the water early in general.

Hendrickson

Best rivers for the Hendrickson hatch

Other rivers with Hendrickson activity

Get a notification when the Hendrickson is on.