Question 1

When does the March Brown hatch occur?

Accepted Answer

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

Question 2

What flies match the March Brown hatch?

Accepted Answer

Standard March Brown fly patterns include March Brown Parachute #10-12, Grey Fox Comparadun #12, March Brown Nymph #12. Sporadic emergence rather than a heavy hatch — but trout key on individual large duns drifting through. Freestone-river specialty.

Question 3

What water temperature triggers the March Brown hatch?

Accepted Answer

March Brown emergence triggers at water temperatures of 55–65°F, with peak activity around 60°F. Read your thermometer, not your calendar.

Question 4

What time of day does the March Brown hatch?

Accepted Answer

The March Brown 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.

March Brown

Best rivers for the March Brown hatch

Other rivers with March Brown activity

Get a notification when the March Brown is on.