Copyright 2013 James Marsh
Hatches and Trout Flies for the Green River in Wyoming
The hatch times on the tailwater section vary some from those of the freestone stream. Also
you will find the freestone part varies also with the elevation. The higher the elevation, the
colder the water and the later the hatches will occur.
The Blue-winged Olive is one of if not the most important aquatic insect to imitate on the
Green River. There are hatches starting in March and lasting into May and then another
hatch that occurs in the late summer and early fall from about the first of September
through October into November in some areas.
PMD's or Pale Morning Duns hatch from the last of June through the month of August. They
are one of if not the most important hatches. Trico mayflies hatch in late September until the
first week of October.
During the later part of July, the Gray Drakes hatch. This is a good hatch that can last
through the month of August.
Little Yellow Stoneflies, or Yellow Sallys, hatch at different times depending on the elevation
of the stream. Normally from about the first of July through August you will find them at some
point on the river. There are some Golden Stoneflies and even some Salmonflies in the
upper headwater section of the river. The Goldens show up around the end of July and the
Salmonflies a week or two earlier. This is usually near the end of the spring runoff time.
Caddisflies are very plentiful, especially in the tailwater section. There are hatches of
Spotted Sedges from May through August in different part of the river. There are several
species of these and the tailwater section usually has one of them hatches just about any
time during this period. There are also hatches of Short-horned Sedges that start in June
and last about a month.
Green Sedges hatch from about the first of June through August, again depending on the
particular section of the river. There are several other caddisflies that hatch on the Green
River but those listed above are the largest hatches.
Terrestrial insects start becoming important in July. They will last until the first frost of
September or early October. Imitations of beetles, grasshoppers and ants work during this
Don't forget about streamers. They are especially important in the tailwater section where
there are lots of sculpin and all types of small minnows and baitfish present. The large ones
are popular for the large brown trout, especially during the fall spawning season.
If you haven't done so already, we ask you to try our "Perfect Flies". We have specific
imitations of everything that hatches on the Green River. We feel certain you will find them
very effective. Click Here For Hatch Chart.
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