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|
Salmon Fly -- (Pteronarcys californica) |
 | Progressive hatch moving upstream several miles per day as water temperatures rise. |
| Henry's Fork River | May 20 to June 15 |
| Madison River --
Ennis to Hebgen Dam | June 25 to July 15 |
| Yellowstone River | July |
| Gallatin River | June 15 to July 15 |
Golden Stone -- (Hesperoperla pacifica) |
| Henry's Fork River | July |
| Madison River | July |
| Yellowstone River | June 20 to July 20 |
| Gallatin River | July |
Yellow Sally -- (Isoperia & Suwallia pallidula) |
| Firehole River | June |
| Madison River | July 15 to August 15 |
| Gallatin River | July 15 to August 15 |
| Henry's Fork River | July 20 to August 10 |
|
|
Pale Morning Duns -- (Ephemerella inermis & infrequens) |
| Firehole River | June 1 to July 10 |
| Madison River (YNP) | June 10 to July 15 |
| Henry's Fork River | June 1 to August 31 |
| Madison River | July 1 to August 15 |
| Yellowstone River | July 15 to September 10 |
Western Green Drake -- (Ephemerella grandis) |
| Henry's Fork River | June 20 to July 5 |
| Madison River (YNP) | June 15 to July 10 |
Brown Drake -- (Ephemera simulans) |
| Henry's Fork River | June 25 to July 10 |
| Gibbon River | June 25 to July 10 |
Small Western Green Drake -- (Ephemerella flavilinea) |
| Henry's Fork River | July 5 to July 30 |
| Madison River | July 15 to August 10 |
| Yellowstone River | July 20 to August 10 |
Gray Drake -- (Siphlonurus occidentalis) |
| Slough Creek | July 15 to September 15 |
| Yellowstone River | July 15 to September 15 |
Callibaetis -- (Callibaetis americanus) |
| Hebgen Lake | July 15 to September 15 |
| Henry's Fork River | August to September 15 |
Trico -- (Tricorythodes minutus) |
| Hebgen Lake | July 10 to September 15 |
| Madison River | August 1 to September 30 |
| Henry's Fork River | August 1 to September 30 |
Blue Wing Olive -- (Baetis, many species) |
| Firehole River | June, September, October |
| Henry's Fork River | June, September, October |
| Madison River | September 1 to October 15 |
| Yellowstone River | August 1 to October 30 |
|
| Firehole River | June 5 to July 15,
September 10 to October 20 |
| Henry's Fork River | June 1 to September 10 |
| Madison River | June 25 to August 20 |
| Gallatin River | July 1 to August 20 |
| Yellowstone River | July 15 to August 30 |
| TERRESTRIALS - Hoppers, ants, beetles, crickets |
|
| All streams | July 20 to September 15 |
