Copyright 2015 James Marsh
Hatches and Flies for Grayling Creek (YNP)
There are several species of caddisflies, mayflies, and stoneflies in Grayling Creek. It has
a very good population of aquatic insects for such a small stream. Don't let the fact it is a
smalls stream fool you into thinking the hatches are not important.
Blue-winged Olives, Baetis species, hatch from opening day until the end of the month of
June but it is usually too early to fish the stream. They are bi-brooded and hatch again
staring about the first of September and lasting until the season ends.
The Green Sedges, very plentiful in Grayling Creek, start hatching about the first of July
and last until the middle of September. The Little Short-horned Sedges will hatch
throughout the month of July.
Spotted Sedges hatch in good quantities and some Little Sister caddis hatch on this
stream. The Spotted Sedges get underway about the middle of July and last into
The PMDs, or Pale Morning Duns, are the most plentiful mayfly on this small stream. They
start about the first of July, and last all the way to the middle of August. We have also
found Green Drakes and Flavs, or small Western Green Drakes present in fairly good
quantities in July.
Yellow Sallies, or Little Yellow Stoneflies, hatch from about the middle of July for a month or
longer. There are lots of both Golden Stoneflies and Salmonflies. They about the second
week of July and last about two or three weeks. The Golden Stoneflies follow shortly after
the Salmonflies and at times, both may be hatching.
Terrestrial insects work very good on Grayling Creek. Imitations of grasshoppers, spruce
moths, ants and beetles will catch trout from about the first of July until the middle to end of
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. They are not only are the most realistic flies you can buy, they are the
most effective at catching trout. We also have numerous generic and attractor flies at very
low prices that will work for the small brook trout.
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Grayling Creek (YNP)
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