| | Acc. No. | Year | Location | County | Observers |
| 1902-001 | 1902 |
Palmer Lake
| El Paso | W.C. Ferril |
| 1904-002 | 1904 |
Pueblo
| Pueblo | B.E. Voight |
| 1956-002 | 1956 |
Denver
| Denver | J. Ormsby |
| 55-72-5 | 1972 |
Castlewood Canyon State Park
| Douglas | Dominic Bartol |
| 55-72-25 | 1972 |
Gunnison
| Gunnison | Sidney Hyde |
| 55-76-115 | 1976 |
Boulder
| Boulder | Freeman Hall |
| 55-77-53 | 1977 |
Lower Poudre Canyon
| Larimer | Elyse Bliss |
| 55-79-20 | 1978 |
Powderhorn
| Gunnison | Jim Bredy |
| 55-87-84 | 1986 |
Tamarack Ranch State Wildlife Area
| Logan | Jerry Cairo |
| 55-90-68 | 1990 |
Two Buttes State Wildlife Area
| Baca | Dan Bridges |
| 55-90-69 | 1990 |
Canon City Riverwalk
| Fremont | Mark Janos |
| 55-92-19 | 1992 |
Lamar Community College
| Prowers | Mark Janos |
| 2013-277 | 1994 |
Boulder
| Boulder | Randall Siebert |
| 55-95-93 | 1995 |
Two Buttes State Wildlife Area
| Baca | Brandon Percival |
| 2001-038 | 1996 |
Boulder
| Boulder | Virginia Dionigi, Tony Esposito |
| 55-96-96 | 1996 |
Highlands Ranch
| Douglas | LeaAnn Brown |
| 1996-501 | 1996 |
Grand Junction
| Mesa | Coen Dexter |
| 1997-104 | 1997 |
Boulder
| Boulder | Daniel Evans |
| 1998-161 | 1998 |
Fort Lyon Wildlife Area
| Bent | Mark Janos, David Quesenberry |
| 1998-145 | 1998 |
3V Rd 2 mls E of Hwy 71
| Lincoln | Chris Wood |
| 1998-146 | 1998 |
Long Pond and surrounding lakes
| Larimer | Rachel Hopper, BB Hahn, Alex Cringan |
| 2000-144 | 2000 |
Two Buttes State Wildlife Area
| Baca | Chris Wood |
| 2000-145 | 2000 |
Dry Creek
| Rio Grande | Dru & Dave Binney |
| 2000-146 | 2000 |
Pueblo City Park
| Pueblo | Mark Janos |
| 2000-147 | 2000 |
Lamar Community College
| Prowers | Mark Janos |
| 2003-094 | 2003 |
Grayrock Commons, Ft. Collins
| Larimer | Doug Swartz, Rachel Hopper |
| 2004-037 | 2004 |
Lamar
| Prowers | Jane Stulp |
| 2004-036 | 2004 |
Longmont
| Boulder | Joe Harrison |
| 2004-121 | 2004 |
Crow Valley Campground
| Weld | Bryan Guarente |
| 2013-263 | 2005 |
McKay Lake
| Adams | David Ely |
| 2006-057 | 2006 |
Chico Basin Ranch
| Pueblo | Brian Gibbons |
| 2006-082 | 2006 |
Fort Collins
| Larimer | Nick Komar |
| 2006-136 | 2006 |
Prewitt Reservoir State Wildlife Area
| Washington | Glenn Walbek, Joey Kellner |
| 2007-045 | 2007 |
Gregory Canyon
| Boulder | Bill Maynard, Larry Semo, Nathan Pieplow |
| 2008-087 | 2008 |
Gregory Canyon
| Boulder | Andrew Spencer |
| 2009-049 | 2009 |
Gregory Canyon
| Boulder | Nathan Pieplow, Luis "Beto" Matheus |
| 2011-064 | 2011 |
Chico Basin Ranch
| Pueblo | Bill Maynard, Brandon Percival |
| 2011-107 | 2011 |
North Cheyenne Canon Park
| El Paso | Bill Maynard |
| 2011-145 | 2011 |
Pueblo Reservoir area
| Pueblo | Brandon K Percival, Brandon K Percival |
| 2011-138 | 2011 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 2012-164 | 2012 |
Julesburg
| Sedgwick | Steve Stachowiak |
| 2012-193 | 2012 |
40.356131, -105.100949 Just down the way from 1608 Manzanita Court, Loveland CO, 80537
| Larimer | Sean Walters |
| 2014-193 | 2014 |
Not Specified
| Pueblo | Bill Maynard |
| 2016-065 | 2016 |
Robinsong Residence
| Delta | Andrea Robinsong, Coen Dexter |
| 2019-054 | 2019 |
Lyons
| Boulder | Angela Dickerson* |
| 2020-063 | 2020 |
Colorado Springs
| El Paso | Michael Rogers |
| 2020-052 | 2020 |
Nucla
| Montrose | Coen Dexter |
| 2022-065 | 2022 |
Lamar Community College
| Prowers | Luke Pheneger |