Copyright 2013 James Marsh
Hatches and Trout Flies for the Clarke Fork River Montana
The hatches on the Clarke Fork River varies with the different sections of the river. Some of
the insects are only found in certain types of water, so keep that in mind. You want find Trico
mayflies in the fast water of the headwater sections, for example.

The Blue-winged Olives are among the most important hatches. The BWOs start hatching
about the middle of March. It can last until the end of April. A second hatch takes place starting
about near the end of September. It can last until the first of November, depending on the

Another important mayfly is the Pale Morning Dun. They hatch starting about the middle of
June and lasting until as late as the first of August. There is a March Brown hatch that takes
place about the last week of March and through the month of April but only in the fast water
areas. The only other substantial hatch of mayflies are the Tricos. These hatch on the slower,
smoother sections of water during August and September.

Caddisflies can be the most important insects at times. Spotted Sedges are the most plentiful
species. They start hatching around the first of July and can last through the month of August.  
There is a Little Black Caddis hatch, called the Mother's Day Hatch, that starts in mid April and
last through the month of May, depending on the section. The big October Caddis hatch from
about the middle of September through October. There are several other species of
caddisflies in the Clarke Fork River but they usually don't exist in plentiful quantities.

Stoneflies are plentiful in most sections of the Clark Fork. About the first of March you will find
two species of stoneflies on the Clark Fork River. The Winter Stoneflies hatch until about the
middle of April. Skwala Stoneflies start abut the middle of March and last through the middle of
April. The Salmonflies usually start about the first of June and last through July, depending on
the section of the river. About the first of June the Golden Stoneflies start hatching. They hatch
through the month of July, depending on the section of the river. Yellow Sallies, or Little Yellow
Stoneflies, hatch from the middle of May all the way through the middle of August, again,
depending on the section of the river.

Make sure you have a good selection of streamer flies. The river has plenty of minnows,
baitfish species and sculpin. Streamers work great early and late in the day, and when the
water is stained from heavy rains.

Terrestrials become very important during the months of July, August and September.
Imitations of ants, beetles, and grasshoppers work great at times.

Midges hatch throughout the year but are most important during the months of March and

We recommend Perfect Flies. You can get specific imitations of every aquatic insect that
hatches in the Clark Fork River. If you haven't done so already, we hope you will give the flies
a chance to work for you. We feel confident that you will be more than satisfied with them.
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Clarke Fork River,
Options For Selecting Flies:
1. Email us with the dates you will be
fishing this stream and we will send
you a list of our fly suggestions. Please
allow up to 24 hours for a response.

2. Call us 800-594-4726 and we will
help you decide which flies you need.

3. Call or email us with a budget for
flies and we will select them and get
them to you in time for your trip.

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