March Brown
March Browns are large, sturdy mayflies that emerge from fast, rocky riffles in May and early June.
Top fly patterns
Affiliate disclosure — links go through our /go/ redirector.
Month-by-month activity
Number of rivers where the March Brown hatch is active each month.
Rivers where March Brown hatches
How to fish the March Brown
A size 10–12 March Brown, American March Brown, or Hare's Ear fished in or just below the surface film.
Frequently asked
When does the March Brown hatch?
Peak emergence: May, June. Timing varies by elevation, latitude, and water temperature.
What flies match the March Brown hatch?
Top patterns: March Brown (size 10-12).
What rivers have a good March Brown hatch?
March Brown hatches are documented on 10 rivers including: Farmington River, Housatonic River, Salmon River, Willimantic River, Deerfield River and 5 more.
How do I fish the March Brown hatch?
A size 10–12 March Brown, American March Brown, or Hare's Ear fished in or just below the surface film.
What is the March Brown?
March Browns are large, sturdy mayflies that emerge from fast, rocky riffles in May and early June. Family: Mayfly (Heptageniidae).
Related
Fly recommender · All hatches · All fly patterns · All rivers