This is the hatch chart for the Yellowstone river in North Western Wyoming.
| Common Name | Dates of Emergence |
| Little Blue-Winged Olive | April 20 - June 10 |
| Black Caddis | May 1 - May 30 |
| Caddis (various) | May 1 - May 30 |
| Salmonfly | June 15 - July 15 |
| Mahogany Dun | Sep. 1 - Sep. 20 |
| Little Blue-Winged Olive | Aug. 15 - Sep. 30 |
| Terrestrials | Aug 1 - Sep. 15 |
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