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March Brown

March Brown Flies

The March Brown hatch is one of the most anticipated spring mayfly hatches on trout rivers across North America. Both Western species (Rhithrogena) and Eastern species (Stenonema / Maccaffertium) produce large mayflies that bring trout to the surface during warm spring afternoons. These insects are commonly found on freestone rivers and riffled water where trout feed aggressively during the hatch.

March Browns typically appear from April through early June, depending on water temperatures and location. During the hatch, trout often feed on emerging nymphs first, followed by adult mayflies drifting on the surface.

Below you’ll find our selection of March Brown fly patterns, tied in proven styles and sizes for trout waters across the United States.

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  • Hare's Ear-Beadhead

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    Beadhead Hare’s Ear Fly The Beadhead Hare’s Ear is one of the most versatile and reliable nymph patterns ever tied—and for good reason. Built to im...

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    Flashback Hare's Ear-Beadhead

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    A great improvement on this all-time classic pattern. Many nymphs take on a very shiny appearance right before emerging. Trout key in on this vu...

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    Hares Ear RubberLegs-Beadhead

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    All the amazing benefits of the Beadhead Hare's Ear with the added movement and enticing properties of rubber legs. Still the #1 nymph in the wor...

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    Gray Fox - Mayfly Dry Fly

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    Excellent for the Gray Fox hatch of West Virginia and other places. Also excellent for the Brown Drake in the Great Lakes regions. March Browns...

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    March Brown Wet Fly

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    Perhaps no other hatch is as anticipated as this early spring hatcher. This pattern also duplicates as a great searching pattern. Rithrogena Germa...

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    Borcher's Drake - Mayfly Dry Fly

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    Every once in awhile a fly comes around that is both extremely effective and versatile, that would be an underestimate for the Borcher's Drake. Kn...

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    Morrish's May Day - Umpqua

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    This sneaky little dry/emerger pattern can trick even the pickiest trout. The simple pattern has the right amount of wing material to really pique ...

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    March Brown Tungsten Bomb Jig - Fulling Mill (Barbless)

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    Our (Fulling Mill's) weighted jigs are fast proving themselves as some of the most popular flies we make. Designed to get down fast, they're grea...

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How to Fish March Brown Hatches

March Brown hatches are a classic spring event on rivers, with larger mayflies that often bring trout to the surface. Fish typically feed on nymphs and emergers before rising to adults.

  • Start with nymphs before surface activity begins
  • Fish emergers during the early stages of the hatch
  • Switch to dry flies when trout are consistently rising

When March Brown Hatches Occur

March Brown hatches typically occur in spring and are influenced by water temperature and river conditions.

  • Most common from March through May
  • Often strongest in the afternoon during warmer weather
  • Typically found on rivers with moderate to fast currents

Fly Selection Tips for March Brown

March Browns are larger mayflies, so size and profile matter more than with smaller hatches.

  • Use larger dry flies (sizes 10–14) during active hatches
  • Fish nymphs when trout are feeding below the surface
  • Adjust presentation in faster water and riffles

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