Copyright 2015 James Marsh
Hatches and Flies for the Gibbon River (YNP) Wyoming
The aquatic insects found in the Gibbon River are very plentiful and consist of several
species of caddisflies, mayflies, stoneflies and midges. The smooth water meadow sections
and the fast water canyon sections require a variety of fishing methods and techniques to
keep up with the hatches.
Blue-winged Olives, Baetis species, hatch from opening day until the end of the month of
June throughout the Gibbon River. The are bi-brooded and will hatch again staring about
the first of September and lasting until the season ends.
You may find some Little Black Caddisflies, Grannon species, hatching from the opening of
the season for the first few weeks. The Little Sister Caddis and their big sisters, the
Spotted Sedges usually start hatching about the middle to the last week of June. These
caddisflies will hatch off and on until the middle to the end of August. The Green Sedges
hatch starting about the first of July and last until the middle of October. The Little
Short-horned Sedges will hatch throughout the month of July. There are some Long Horn
Sedges, that will hatch the last two weeks of July. You will also find plenty of Little Brown
caddisflies that hatch the last two weeks of July and the first two weeks of August. All in all,
there is a lot of caddisfly activity on the Gibbon River.
The PMDs, or Pale Morning Duns, are one of the most important mayflies on the river.
They start about the middle of June, depending on the weather and last all the way to the
middle of August. The hatches and spinner falls are both important. There will be some
Green Drakes that hatch from the middle of June until the middle of July. These aren't
huge hatches. The Brown Drakes start at the same time, or the middle of June, and hatch
for a month. They are found in the slow meadow sections of the Gibbon River. In the fast
water sections, you will find Pink Ladies, or the Eperous species, hatching from about the
second week of July through August. March Browns start hatching about the same time
and last through August in the fast water sections. Flavs, or Small Western Green Drake
mayflies, will hatch in the moderate water sections from about the middle of July to the
middle of August.
Golden Stoneflies can be found in the fast water sections of the Gibbon River from about
the first of July to the end of the month. Yellow Sallies, or Little Yellow Stoneflies, hatch
from about the middle of July for a month or longer.
Terrestrial insects are very important trout food on the Gibbon River. Imitations of
grasshoppers, ants and beetles will catch trout from about the first of July until the middle
to end of September. The meadows are especially great for hopper fishing. Don't overlook
the flying ants. They can swam and fall on the water anytime during the summer so be
ready for them if they do.
We have "Perfect Fly" imitations of every insect that hatches in Yellowstone National Park.
Many of our flies were developed there. If you haven't already done so, we encourage you
to give them a try. The not only are the most realistic flies you can buy, they are the most
effective at catching trout.
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Gibbon River (YNP)
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