| | Acc. No. | Year | Location | County | Observers |
| 2010-044 | 1936 |
Fort Collins
| Larimer | Kenny Maehler |
| 1944-003 | 1944 |
Boulder
| Boulder | Unknown |
| 56-78-49 | 1977 |
Conifer area
| Jefferson | Margaret Kunkle, Betsy Webb |
| 56-95-96 | 1995 |
Boulder
| Boulder | Bill Miller |
| 1998-148 | 1998 |
Julesburg
| Sedgwick | Nick Komar |
| 1999-154 | 1999 |
Castlewood Canyon State Park
| Douglas | Urling & Hugh Kingery |
| 1999-155 | 1999 |
Colorado City and Rye
| Pueblo | David Silverman |
| 2010-045 | 1999 |
Boulder
| Boulder | Margie Winter, Bill Kaempfer |
| 1999-156 | 1999 |
Canon City Riverwalk
| Fremont | Peter Gaede |
| 1999-157 | 1999 |
Penrose
| Fremont | Tony Leukering |
| 2000-148 | 2000 |
Colorado City and Rye
| Pueblo | David Silverman |
| 2002-115 | 2002 |
John Martin Reservoir State Park
| Bent | Glenn Walbek, Doug Faulkner |
| 2004-007 | 2004 |
Estes Park
| Larimer | Judith Wright, Barb Anderson, Scott Rashid |
| 2005-145 | 2005 |
South Republican SWA
| Yuma | Cole Wild, Andrew Spencer, Bill Schmoker |
| 2006-002 | 2006 |
Chico Basin Ranch
| El Paso | Tony Leukering. Brandon Percival, Doug Faulkner, Andrew Spencer, Cole Wild, Nick Komar |
| 2006-085 | 2006 |
Crow Valley Campground
| Weld | Cole Wild |
| 2007-028 | 2007 |
Chico Basin Ranch
| Pueblo | Bill Maynard |
| 2009-007 | 2009 |
Fort Lyon Area
| Bent | Cole Wild |
| 2010-141 | 2010 |
La Veta
| Huerfano | Polly Neldner |
| 2015-013 | 2010 |
Castlewood Canyon State Park
| Douglas | Hugh Kingery |
| 2012-198 | 2011 |
Tamarack Ranch State Wildlife Area
| Logan | Steven Mlodinow |
| 2011-165 | 2011 |
Lyons Area
| Boulder | Nick Komar |
| 2011-176 | 2011 |
Berthoud
| Larimer | Shelley Dahme |
| 2012-058 | 2012 |
Lamar
| Prowers | Jane Stulp |
| 2012-052 | 2012 |
Chico Basin Ranch
| Pueblo | Brandon Percival, Bill Maynard |
| 2012-216 | 2012 |
Tamarack Ranch State Wildlife Area
| Logan | David Dowell |
| 2012-084 | 2012 |
Colorado City and Rye
| Pueblo | Dave Silverman |
| 2012-134 | 2012 |
Holyoke
| Phillips | Steven Mlodinow |
| 2012-142 | 2012 |
Flagler Reservoir State Wildlife Area
| Kit Carson | Glenn Walbek |
| 2012-146 | 2012 |
Chico Basin Ranch
| Pueblo | Bill Maynard, Robb Hinds |
| 2013-002 | 2013 |
Wetmore area
| Custer | Brandon Percival |
| 2013-283 | 2013 |
Barr Lake State Park
| Adams | Rob Raker |
| 2013-154 | 2013 |
Tamarack Ranch State Wildlife Area
| Logan | Steven Mlodinow |
| 2013-272 | 2013 |
Banner Lakes State Wildlife Area
| Weld | Cathy Sheeter |
| 2015-033 | 2013 |
Adams Open Space Fountain
| El Paso | Diana Beatty |
| 2015-128 | 2014 |
Chico Basin Ranch
| El Paso | Nancy Gobris |
| 2014-068 | 2014 |
Julesburg
| Sedgwick | Steven Mlodinow |
| 2014-069 | 2014 |
Tamarack Ranch State Wildlife Area
| Logan | Steven Mlodinow |
| 2014-140 | 2014 |
Fox Ranch
| Yuma | Steven Mlodinow |
| 2014-170 | 2014 |
Rocky Mountain Arsenal National Wildlife Refuge
| Adams | Adam Vesely |
| 2015-022 | 2015 |
Tamarack Ranch State Wildlife Area
| Logan | David Dowell, Kathy Mihm Dunning |
| 2015-062 | 2015 |
Fox Ranch
| Yuma | Steven Mlodinow |
| 2015-113 | 2015 |
Crow Valley Campground
| Weld | Steven Mlodinow |