| Insect | Size | Begin | End | |
 |
Midges | 18-24 | January 1 | December 31 |
 |
BWO | 16-24 | January 1 | March 31 |
 |
Damsels | 6-12 | April 15 | August 31 |
 |
Ants | 14-18 | April 15 | September 15 |
 |
Salmonflies | 6-14 | May 15 | July 15 |
 |
Beetles | 14-18 | May 15 | September 15 |
 |
Caddis | 12-20 | May 15 | October 15 |
 |
PMD | 14-20 | June 1 | September 15 |
 |
Golden Stones | 8-14 | June 15 | August 15 |
 |
Yellow Sallies | 12-18 | June 15 | August 15 |
 |
Hoppers | 8-14 | June 15 |
September 25
|
 |
Flying Ants | 14-18 | August 15 | September 15 |
|
BWO | 16-24 | September 1 | December 31 |
Visit our Colorado Flies by Location page here:
