Copyright 2015 James Marsh
Hatches and Trout Flies for the Gallatin River - Yellowstone National
You will find a early season Blue-winged Olive hatch during June and a late season one that
starts in late September and early October. Don't overlook them because when they are
hatching, they are often by themselves.
Little Black Caddis, called the Mother's Day Hatch in the West, may be hatching when the
season first starts. You may want to be prepared for it if you fish during early June.
PMDs, or Pale Morning Duns are the most consistent of the mayflies on the Gallatin River in
the park. They start hatching about the Middle of June and last almost through the month of
August into early September.
Spotted Sedges are very plentiful. They start hatching around the first week of July and last
through August. Green Sedges are very plentiful. Imitations of their larvae, called Green Rock
Worms, will catch trout all during the season. These caddisflies hatch from about the middle of
June all the way through September and into October. There are several species of them.
Little Short-Horned Sedges hatch from about the middle of July until the middle of August.
Little Sisters are fairly plentiful and usually start hatching about the end of July. They last for
about three weeks. Little Brown Caddis are also fairly plentiful. They begin hatching about the
middle to the end of July and last about two weeks.
Green Drakes hatch from about the third or forth week of June for about three weeks. The
weather and water temperature can vary this hatch a week or two and even more some years.
It is not very heavy but they do hatch on the Gallatin. Flavs, or Small Western Green Drakes
start hatching about the middle of July and last almost a month. They are only fairly plentiful.
Salmonflies are present in the Gallatin River, but not in huge quantities inside the park section.
They are far more plentiful in the canyon section outside the park. They start hatching about
the first to the middle of July and last around a couple of weeks. Golden Stoneflies will start
hatching about the same time as the Salmonflies, or just a little past the time they hatch. Yellow
Sallies, or Little Yellow Stoneflies, are plentiful and hatch about the middle of July until the
second week in August.
You will find Pink Ladies, or the Eperous species, hatching from about the last week of July
through August. March Browns start hatching about the same time and last through August..
Grasshoppers, ants and beetles are very plentiful. The high grass and shrubs along the banks
of the stream are a perfect habitat for them. Imitations of these insect will work during July,
August and most of September.
Streamers that imitate sculpin work great in the Gallatin. You should use them early in the
season when the water is still cold, anytime it is slightly stained from heavy rain and during low
light conditions such as early and late in the day.
Our "Perfect Flies" have been tested extensively on this river and have proven to be more
effective than any of the generic or attractor flies. If you haven't tried them already, we
certainly hope you will. We have specific imitations of everything that hatches on the Gallatin
River in all stages of life that trout eat them in.
Gallatin River, YNP
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