| Insect | Size | Begin | End | |
 |
Sculpins |
2-12 | January 1st | December 31st |
 |
Leeches | 2-12 | January 1st | December 31st |
 |
BWO |
16-20 | March 1st | November 30th |
 |
Caddis |
10-18 | March 1st | September 30th |
 |
Golden Stoneflies |
8-12 | May 1st | August 31st |
 |
Salmonflies | 6-10 | May 1st | July 31st |
 |
PMD |
14-18 | June 1st | September 30th |
 |
Red Quill | 12-16 | June 1st | September 30th |
 |
Green Drake | 10-14 | June 1st | August 31st |
 |
Yellow Sally | 14-16 | July 1st | September 30th |
 |
Terrestrials |
6-18 | July 1st | September 30th |
 |
Midges |
18-24 | September 1st | March 31st |
Visit our Colorado Flies by Location page here:
