Insect
Chart |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sept |
Oct |
Little Black Stones
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March and April hatch
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crawls to shore to hatch, very small, small black stone
nymphs fished slow & low
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Blue Winged Olive

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Look for these guys
anytime during the season.
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one or another species of BWO can be found hatching
throughout the year in most streams and in most types of currents - probably the Baetis
nymph, BWO dry & compare duns will produce the most results for you. Often known
to hatch in poor weather conditions.
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Quill Gordon

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Mid-May to early June
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This hatch and the Hendrickson hatch often overlap.
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Hatches underwater, fast water, hare's ear wet,
Quill Gordon dry
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Hendrickson

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Mid-May to Mid June
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This
is an early hatch and often the fish aren't looking up yet - think
nymphs.
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10's & 12's our first big fly hatch, standard dry
& nymph pattern, mid-day hatch 2 - 4pm, 50-55 degree water.
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Cornuta
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Mid-May to late June
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>>>>>>>>>>>>>
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A BWO with three tails and bigger than most (14), morning
hatch, use pale green emerger, dun darkens upon emergence to
olive.
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March Brown
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Early to late June
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>>>>>
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another big mayfly, sporadic hatches all day
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Yellow Stones

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Peak in June - last until August
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yellow stone nymph, retrieve slowly towards shore, insect
does not hatch in water.
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Gray Caddis
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Mostly
in April and May - some in June
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Midday hatch. Gray Elk Hair Caddis
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Tan Caddis
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Peak late May through
August - waning in September
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apt to hatch any time of day, more common in the pm - tan
elk hair caddis - tan emerger
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Olive Caddis
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Peak late May
through August - waning in September
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Actually several species
grouped together. Size range 14-18. Color ranges from
dark olive to bright green. When in doubt try one.
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Little Black Caddis
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1st week of June thru Mid August, small size 16
- 18, black elk hare caddis, mid-day, riffles
& runs
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Peak
June through August - waning in September
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Light Cahill

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June and
July - last big fly hatch of the season they all get small after
this one.
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size 10 & 12, mid-day to late evening, runs
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Insect
Chart |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sept |
Oct |
I do
not profess to know a lot about aquatic insects. Most of
what you find here is taken from my field notes and they are vague
at best. If you think some important insects are left out,
let me know. If you feel some of the dates are wrong,
let me know. I offer this is a very informal, very amateur
chart, and will welcome upgrades.
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