Montana Fly Fishing Guides - Hatch Chart
X - major emergence
x - minor emergence
| Insects |
Size |
J |
F |
M |
A |
M |
J |
J |
A |
S |
O |
N |
D |
| Stoneflies |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Salmon Fly |
2-6 |
|
|
|
|
|
X |
x |
|
|
|
|
|
| Golden Stone |
4-8 |
|
|
|
|
|
X |
x |
|
|
|
|
|
| Brown Stone |
12-14 |
|
|
|
|
|
|
|
X |
x |
|
|
|
| Yellow Sally |
14-16 |
|
|
|
|
|
|
X |
|
|
|
|
|
| Little Black Stone |
16 |
|
x |
x |
x |
|
|
|
|
|
|
|
|
| Caddis Flies |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Early Grannom |
12-16 |
|
|
|
X |
x |
|
|
|
|
|
|
|
| Spotted Caddis |
12-16 |
|
|
|
|
|
|
x |
X |
X |
x |
|
|
| Little Brown
Caddis |
14-18 |
|
|
|
|
|
|
X |
x |
|
|
|
|
| Plain Brown Caddis |
14-18 |
|
|
|
|
|
|
X |
|
|
|
|
|
| Mayflies |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Western Green Drake |
10-12 |
|
|
|
|
|
x |
x |
|
|
|
|
|
| Western March Brown |
14 |
|
|
|
X |
x |
|
|
|
|
|
|
|
| Hecuba |
12-14 |
|
|
|
|
|
|
|
x |
x |
|
|
|
| Pale Morning Dun |
16-20 |
|
|
|
|
|
|
X |
x |
|
|
|
|
| Yellow Quill |
14-16 |
|
|
|
|
|
|
|
x |
x |
|
|
|
| Blue Winged Olive |
18-20 |
|
|
X |
X |
|
|
|
|
x |
X |
|
|
| Trico's |
18-22 |
|
|
|
|
|
|
|
x |
x |
x |
|
|
| Terrestrials |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Grasshoppers |
8-14 |
|
|
|
|
|
|
x |
X |
X |
x |
|
|
| Ants |
16-20 |
|
|
|
|
|
|
x |
x |
x |
|
|
|
| Beetles |
12-18 |
|
|
|
|
|
|
x |
x |
x |
|
|
|
| Misc. |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Midges |
16-24 |
x |
x |
x |
x |
|
|
|
|
|
x |
x |
x |
| Streamers |
2-8 |
All
Year |
| Insects |
Size |
J |
F |
M |
A |
M |
J |
J |
A |
S |
O |
N |
D |