| | Acc. No. | Year | Location | County | Observers |
| 2006-102 | 2006 |
Cortez Airport and adjoining farmland
| Montezuma | Joe Roller, Norm Erthal, Brandon K. Percival, Joey Kellner, Bill Maynard, Nathan Pieplow, Rachel Hopper, Andrew Spencer, Cole Wild |
| 2014-130 | 2014 |
Nucla
| Montrose | Coen Dexter |
| 2016-028 | 2016 |
Roxborough State Park
| Douglas | Mark Obmascik, Peter R. Gent, Cheryl Teuton, Norm Lewis |
| 2017-024 | 2017 |
Cortez
| Montezuma | Charles Haspels |
| 2019-062 | 2019 |
Westerly Creek Park
| Denver | Luke Pheneger |