Copyright 2014 James Marsh
Hatches and Trout Flies for the Lamar River- Yellowstone National
The hatches on the Lamar River are varied and plentiful. This stream stays cold until well on
into the summer and in general, hatches run behind most other streams in other sections of
the park.

Blue-winged Olives are hatching when the water first clears. There are several species
including the
baetis. There's an early season baetis hatch the first part of July and the another
hatch near the first of September.

PMDs, or Pale Morning Duns, are the bread and butter hatches and also the most consistent
hatches of the mayflies on the Lamar River. They are usually hatching when the water first
clears and last into the middle of August.

Spotted Sedges are very plentiful. These caddisflies start hatching around the first part of July
and last through August. Their Little Sister  hatch during the same time period. Green Sedges
are very plentiful throughout the river. Various species of these caddisflies hatch from about
the middle of July all the way into October.  Little Short-Horned Sedges hatch during the
second half of July.

There will be a few Gray Drakes that hatch from about the middle of July until the first week of
September. Pale Evening duns, or
Heptagenia species of mayflies, hatch from about the first
of August until September.

Near the end of August, fall hatches of Green Drakes start occurring. This hatch can really
turn the trout on. It usually last about three weeks.

There will be a few Salmonflies present in the fast water sections. They may still be hatching
when the water first clears from the  runoff. Golden Stoneflies start hatching about the same
time. Yellow Sallies, or Little Yellow Stoneflies, are plentiful in the Lamar River. They start
hatching the later part of July and last until the second week in August.

You will find Yellow Quills, or the
Eperous species, hatching from about the end of July through
August. Western March Browns start hatching about the same time and last through August.

Grasshoppers, ants and beetles are very plentiful in the meadow sections of the Lamar River.
The high grass along the banks of the meadows are a perfect habitat for them. Imitations of
these insect will work during late July, August, September.

Don't forget to have a good selection of streamers. They may become necessary if the water
becomes stained and it often does.

We recommend "Perfect Flies" for the Lamar River. They have proven to be more effective
than any of the generic or attractor flies. We have specific imitations of everything that hatches
and in all stages of life that the trout eat them in. If you haven't already tried them, we certainly
hope you will. The "Yellow Marabou Sculpin" is an excellent choice for this stream.
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Lamar River, YNP
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. Email us (
with a budget for flies and we will select
them to match the budget and get them to
you in time for your fly fishing trip.

All orders are shipped free in the
U. S. Orders over $100 are shipped via
Priority Mail.