Copyright 2013 James Marsh
Hatches and Trout Flies for the Missouri River, Montana
If I had to pick one aquatic insect to imitate the entire year on the Missouri River, it would be
the Blue-winged Olives. Of course there are several different species of them that hatch for
most of the year. They usually start around the middle of March and last until about middle of
June. Some species are bi-brooded and will hatch again in the Fall. Other species, along with
the bi-brooded species, start again about the first of September and hatch until the middle of

Western Green Drakes hatch from about the middle of May through June, but the hatch is
usually sparse. The Little Western Green Drakes, or Flavs, hatch during July and August, but it
is also a sparse hatch.

Pale Morning Duns hatch from about the middle of June to the middle of August. These
hatches can be fairly good and consistent. From about the first of September into the first
week or two of October, you will find a few Mahogany Duns hatching.

One of the better hatches that occurs on the Missouri River are the Tricos. They start about
the first of July and last through the month of August. These hatches can be very prolific.

There are many species of caddisflies that hatch on the Missouri. Probably the most plentiful
species are those called Spotted Sedges. They hatch during the months of June and July. You
also have a Little Black Caddis, or
Brachycentrus hatch that occurs in May and again, during
from the middle of July through August. The first hatch is usually called the Mother's Day Hatch.

Little Short-horned Sedges, which are the saddle cased caddis, hatch from about the first of
June through July. In October and November, you will find hatches of October Caddis. This can
be a very good hatch to fish on the Missouri River.

Green Sedges hatch from about the first of July through September. Imitations of their larva
stage of life, called Rock Worms, can be a good fly to use anytime of the year.

Scuds and Sowbugs are very plentiful and fish can be caught using imitations of both just
about anytime of the year. Our Perfect Fly imitations are the best you can buy along with just
about any other insect you will find on the river. Crayfish are also plentiful. Imitations of them
will catch the large brown and large rainbow trout.

There are also plenty of the various species of baitfish and sculpin in the river. Streamers that
imitate them are effective anytime during the season, but are most effective when it is near
dark or very early in the morning. They also work good if the water has any color to it, but that
is rather rare.

Terrestrials are very important starting about the first of July and lasting through September.
Grasshoppers are very abundant because the river is surrounded by hay fields in most areas.
Hoppers are very, very plentiful. Ants and beetles also work at times, so don't forget about

As alway, we recommend our "Perfect Flies". Simply put, they are the best flies you can buy.
They are not only the most realistic imitations of the insects, they are the most effective in
catching trout. If you haven't already done so, we hope you will give them a try.
Missouri River, Montana
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