Yellowstone National Park - Perfect Fly Hatch Charts
.............................Fly Fishing Yellowstone National Park


New Hatch Chart - Firehole River

We have had a hatch chart for the Firehole River in Yellowstone National Park since
we launched the site but we now have
another one on our Perfect Fly site that directly
links to the flies that are needed to imitate each insect, crustacean or marine
species. It is a part of what will be a series of hatch charts for every major trout
stream in the United States and Canada.

The Firehole River is a complex trout stream. It is also a complex aquatic insect stream
because of the thermal influence of geysers and the various chemical makeup of the
water. The insects we list are known to hatch there in substantial quantities but there
are many others that exist in the stream. We don't think any of them are present in
substantial quantities or quantities worth listing and imitating but we are certainly not
sure. When you are fishing and something is hatching that the trout are eating, it
becomes important - period. From that standpoint, any insect that causes the trout to
feed on it is worth listing, so we are open to listening to anyone who has specific
knowledge of other hatches that takes place on the Firehole River. If you have
encountered other hatches not listed here, by all means let us know. Please email us

We also want to mention that pinpointing hatch times of any aquatic insect is always a
good guess but in the case of the Firehole River, it probably takes a very good guess
to hit everything correctly. Weather at the high elevations of Yellowstone National Park
is tricky itself. It can change in a heartbeat and usually does. What you have to be
concerned about is a trend in weather conditions. If the weather has been
unseasonable cold for a couple of weeks or more, then you need to allow a couple of
weeks for the hatches to take place. If it is the opposite and the weather has been
unseasonable warm, you need to take into consideration that the hatches may occur
earlier. When the weather changes back and forth during the period of a hatch is can
extend the length of time it occurs. You always have to consider the weather trends
when you are counting on fishing certain hatches.

From some standpoints the Firehole is more stable than other streams in Yellowstone.
The geysers tend to stabilize what the weather can change in terms of water
temperature. You will notice that there are quite a difference in the hatch times of the
Firehole River and the Madison River which, along with the Gibbon River, forms. There
are also some differences in the insects that are present.

Although it is a very strange river that is affected by the geysers, it is still one of the
finest trout streams in the world. We hope this hatch chart and flies that are linked to it
will help you catch more trout on this wonderful stream. Again, I would like to
encourage anyone with additional or contradicting information to please let us hear
from you.

Copyright 2008 James Marsh     
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