Copyright 2013 James Marsh
Hatches and Trout Flies for Rock Creek
Like most other trout streams, Rock Creek has it's share of Blue-winged Olives. They start
hatching in some locations as early as the middle of March and continues on into the first
week or two of June. These little mayflies are bi-brooded and will start hatching again by
the first of September. The second wave of the BWOs will continue until almost the end of
March Brown mayflies start hatching near the end of March and last through the month of
April. Another species of them hatch out in late August, September and on into the first
two weeks of October, depending on the particular section of the stream in August and
There's the usual PMD, or Pale Morning Dun hatch that occurs over a long period of time.
It starts about the first of June and last almost all the way through September. In addition,
Rock Creek has an "okay" hatch of Green Drakes, but its usually not a huge hatch. It
starts about the middle of June and last until the middle of July, depending on the section
of the stream. Mahogany duns hatch in September and October and Trico hatch in the
slower sections of the stream from
There's an early Skwala Stonefly hatch that occurs, starting about the first of March and
last through most of April. You will also find some Little Brown Stoneflies hatching during
this same time period. The Salmonfly hatch often occurs during the runoff. It is hit or miss,
mostly miss hatch at Rock Creek. It occurs from about the last week of May through the
month of June.
The Golden Stoneflies are often still around after runoff and they can provide a lot of
action some years. The hatch starts just before the first of June and last through August.
The main stonefly attraction at Rock Creek is the Yellow Sally. They hatch over a long
time at one place or another along the fifty mile long creek. It starts about the first of June
and last all the way through mid August.
The most important caddisfly hatches are those of the Spotted Sedges. They start
hatching about the end of May and last all the way through the middle of August. Their
Little Sister Caddisflies are not that plentiful, but can be found hatching from about the
middle of June through August. From about the middle of June through July, you will find
some Little Short-horned Sedges. Imitations of these little caddisflies will produce.
The Green Sedges are the most important caddisflies on Rock Creek. Several species of
them hatch from about the middle of June through the middle of September. There's
usually a very good October Caddis hatch. It occurs from about the middle of September
until the first or second week in October.
Terrestrials are important insects to imitate during the months of July, August and
September. Imitations of grasshopper, beetles and ants will catch their share of trout on
Rock Creek. Midges hatch year-round, but are more important when other insects are not
hatching. We show them important for March and April and again during October and
November, so you may want to have some midge larva, pupa and adult imitations with you
during that time period.
Don't forget to have a good selection of streamers. The stream has plenty of baitfish,
minnows and sculpin. Imitations of these small fish can produce at times, especially early
and late in the day and when the water is slightly stained from rain.
Please consider using our "Perfect Flies". They are not only the most realistic imitations of
the aquatic and terrestrial insects at Rock Creek, they are the most effective at catching
trout. If you haven't already done so, we certainly hope you will give them an opportunity
to work for you. We suggest you use our Rock Creek Hatch Chart and select the flies for
the time period you will be fishing.
Rock Creek, Montana
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