Copyright 2013 James Marsh
Hatches and Flies for the Big Thompson River Colorado
Midges exist on the Big Thompson is huge quantities and hatch throughout the
year. Imitations of their larvae, pupae and of the adult work great and are very
important when nothing else is hatching.

The first mayfly hatches are the Blue-winged Olives. They start hatching in April
and continue through the month of May. These are bi-brooded insects that hatch
again in September and October.

Another important mayfly is the Green Drake. These mayflies start hatching
around the first of July and last on as late as the end of August. Red Quills also
hatch during the same time period. They can be just as important as the Green

Golden Stoneflies hatch starting about the middle of June and last through
August, depending on the area of the river you are fishing. Yellow Sallies, or Little
Yellow Stonefies, start hatching in late May and can last well into August.

There are several species of caddisflies. The first important ones to hatch are the
Little Black Caddis from the
Branchycentrus genus. These Grannom caddisflies
start hatching about the first of May. It usually last about a month. This hatch
starts in the lower elevations and works upstream.

During June, July, August and September, you will find different species of Spotted
Sedges, or net spinning caddisflies. There are also a few of their Little Sister
Caddis. The Little Sisters hatch during the month of July. Little Short-horned
Sedges hatch in late May and  early June. They are the little caddisflies that crawl
up your waders. Theres also species of Green Caddisflies, or Green Sedges, as
they are often called. The larvae of these caddisflies are called Green Rock
Worms. Imitations of them are very effective from about June through August.
There are few other species of caddisflies present in the river, but none of them
hatch in large quantities.

Terrestrial insects become important during the months of June, July, August and
September. Imitations of grasshopper, ants and beetles are all effective during
these months during this time.

Theres a lots of Sculpin in the river and a few different species of minnows and
baitfish. The streamers are very effective when the brown trout start to spawn in
the fall. They also work anytime the river is a little off color from rain as well as
early in the morning and late in the afternoons.

If you haven't tried our "Perfect Fly" trout flies, we suggest you do. We have
specific imitations of everything that hatches on the Big Thompson River. Please
check them out. We are confident that you won't be disappointed.
Big Thompson
River Colorado
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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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