Copyright 2013 James Marsh
Hatches and Trout Flies for North Platte River Wyoming
ThThe hatches vary some depending on the section of the river but the insects listed below
are plentiful throughout most of the stream from its headwaters to its lower section. During
the early season, before runoff, the main hatches consist of Western March Browns and
Blue-winged Olives. The BWOs can start as early as March but April usually is the most
consistent time for the hatch to begin. There's also a Fall hatch of the BWOs. It usually
takes place from late September and throughout most of the month of October.
Of course, midges will work well anytime the water is too cold for most other insects. There's
also plenty of small black winter stoneflies that hatch in the early season, even when there's
snow on the ground.
You will find some hatches of Salmonflies become to come off in early July in the fast water
sections of the river. Sometimes the runoff effects the fishing conditions during the hatch
and on other years it misses it. It all depends on the snowpack. LIttle Yellow Stoneflies are
also plentiful in some areas in late July and early August. Within a week or two of the end of
the Salmonfly hatch in July, you will usually find Golden Stoneflies beginning to hatch. The
hatch last into the month of August, depending on the location on the river. Both the
Salmonflies and Golden Stoneflies start hatching in the lower section and move upstream
as the days go by.
The first caddisflies to hatch are the Little Black Caddis, called the Mothers Day hatch in
most places in the West. This hatch starts in the lower section of the river in late April and
last about a month. In late June and early July, there's plenty of Spotted Sedges that begin
to hatch. These are the most plentiful of the caddisflies and the different species hatch
throughout most of the Summer.
The next most important caddisfly hatch are the Green Sedges. They hatch from May
through August, depending on the species. Imitations of the Green Rock Worms, or their
larvae, work year-round.
In late June, usually before the runoff ends, Pale Morning Duns will start hatching. There
are a few Green Drakes that hatch but the numbers are usually fairly low. There are also
some Flavs, or Small Western Green Drakes, but the numbers of them are relatively low.
The PMD hatch will last most of the summer and is the most consistent mayfly hatch. In
some areas of the fast water you will find some Pink Ladies that hatch in late August and
Late Summer, in August and September, terrestrials will play an important role in the trout's
diet. Don't forget imitations of grasshopper, ants and beetles.
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