Montana Emergence Schedule - Hatch Chart
Items in BOLD and Highlighted in Claret indicate Major hatch
| Time of Year |
Size |
Latin |
American |
|
All Year |
16 - 24 |
Chironomidae |
Midge |
|
April 1 – June 10 Sept 1 – Nov 30 |
20 - 24 |
Baetis tricaudatus & punctiventris |
Blue Winged Olive |
|
April 30 – Aug 10 |
14 - 16 |
Brachycentrus occidentalis |
Grannom Caddis |
|
May 20 – July 30 |
14 - 16 |
Hydropsyche cockerelli |
Tan Caddis |
| June 1 - July 30 | 14 - 18 |
Ephemerella inermis & infrequens |
Pale Morning Dun |
|
June 1 – July 20 |
8 - 10 |
Arctopsyche grandis |
Great Grey Spotted Sedge |
|
June 1 – Sept 1 |
14 - 16 |
Cheumatopsyche campyla |
Little Sister Sedge |
|
June 10 – Aug 20 |
12 - 14 |
Rhithrogena morrisoni |
Black Quill |
|
June 20 – July 30 |
10 - 12 |
Drunella grandis |
Green Drake |
|
June 20 – Sept 20 |
14 - 16 |
Rhyacophila bifila & coloradensis |
Green Sedge |
|
June 20 – Aug 30 |
14 - 16 |
Oecitis avara & disjuncta |
Longhorn Sedge |
|
June 20 – July 30 |
20 - 22 |
Glossosoma montana |
Little Black Caddis |
|
June 20 – July 30 |
4 - 8 |
Pteronarcys californica |
Salmon Fly |
|
July 1 – Aug 30 |
14 - 16 |
Drunella flavilinea |
Small Western Green Drake (Flav) |
|
July 1 – Aug 30 |
14 - 16 |
Callibaetis ferrugineus hageni |
Speckled-Wing Spinner |
|
July 1 – July 30 |
6 - 8 |
Hesperoperla pacifica |
Golden Stone |
|
July 1 – Aug 20 |
14 - 16 |
Suwallia pallidula |
Little Olive or Little Yellow Stone |
|
July 10 – Aug 30 |
14 - 16 |
Isoperla |
Yellow Sally |
|
July 20 – Sept 30 |
18 - 22 |
Tricorythodes minutas |
Trico |