| | Acc. No. | Year | Location | County | Observers |
| 1885-003 | 1885 |
Denver
| Denver | A. Anthony |
| 56-74-20 | 1974 |
Pueblo
| Pueblo | Van Truan |
| 56-74-174 | 1974 |
Boulder
| Boulder | Allen Crockett |
| 56-75-21 | 1974 |
Durango
| La Plata | Elva Fox |
| 56-75-10 | 1975 |
Pueblo
| Pueblo | David Griffiths |
| 56-75-148 | 1975 |
Barr Lake State Park
| Adams | Robert Andrews |
| 56-76-25 | 1975 |
Chatauqua Park/Bluebell Canyon
| Boulder | Jack Reddall |
| 56-76-24 | 1975 |
Fort Collins
| Larimer | Ron Ryder |
| 56-76-32 | 1976 |
Chatauqua Park/Bluebell Canyon
| Boulder | Jack Reddall |
| 56-76-101 | 1976 |
Boulder Creek (downtown section)
| Boulder | Van Remsen |
| 56-76-111 | 1976 |
Barr Lake State Park
| Adams | Robert Andrews |
| 1976-001 | 1976 |
Fort Collins
| Larimer | unknown |
| 56-77-12 | 1977 |
Colorado Springs
| El Paso | Dave Griffiths |
| 56-77-10 | 1977 |
South Republican SWA
| Yuma | Judd Sundine, Mike Moulton, Peter Moulton |
| 56-80-85 | 1980 |
Poudre River Trail (Ft. Collins section)
| Larimer | Daniel Butler |
| 56-82-44 | 1981 |
South Republican SWA
| Yuma | Urling & Hugh Kingery |
| 56-83-57 | 1982 |
Fleming
| Logan | Bill Prather |
| 56-83-58 | 1983 |
Colorado Springs
| El Paso | John Maynard |
| 56-85-9 | 1985 |
Lakewood
| Jefferson | John Cooper |
| 56-89-62 | 1989 |
Chatfield State Park (Douglas Portion)
| Douglas | Duane Nelson, Dick Schottler |
| 56-90-77 | 1990 |
Chatfield State Park
| Jefferson | Warren Finch, Mark Janos |
| 56-91-83 | 1991 |
Colorado City and Rye
| Pueblo | David Silverman |
| 56-93-23 | 1993 |
Red Rocks Park
| Jefferson | Bill & Paula Lisowsky |
| 56-93-22 | 1993 |
Burnt Mill Road area
| Pueblo | Brandon Percival |
| 56-94-88 | 1994 |
Doudy Draw and the Mesa Trail
| Boulder | Tony Leukering |
| 56-95-101 | 1995 |
Boulder
| Boulder | Richard Holmes |
| 56-95-102 | 1995 |
Fort Lyon Area
| Bent | Mark Janos |
| 56-96-10 | 1996 |
Rocky Ford
| Otero | Mark Janos |
| 1997-002 | 1997 |
Red Rocks Park
| Jefferson | Tony Leukering, Ric Olson |
| 1999-170 | 1999 |
Franktown
| Douglas | Hugh Kingery, Urling Kingery |
| 2001-140 | 2001 |
Vancorum
| Montrose | Coen Dexter |
| 2004-003 | 2002 |
Chico Basin Ranch
| El Paso | Tony Leukering |
| 2003-090 | 2003 |
Colorado City and Rye
| Pueblo | David Silverman |
| 2004-073 | 2004 |
Lamar
| Prowers | Janeal Thompson |
| 2007-105 | 2007 |
Canon City
| Fremont | Brandon Percival, Chris Wood |
| 2007-107 | 2007 |
Sterling
| Logan | Bill Kaempfer |
| 2008-008 | 2008 |
South Republican SWA
| Yuma | Nathan Pieplow, Larry Semo, Tony Leukering |
| 2008-009 | 2008 |
South Republican SWA
| Yuma | Gregg Goodrich |
| 2008-056 | 2008 |
Colorado Springs
| El Paso | Allan Burns |
| 2009-500 | 2009 |
Fruita
| Mesa | Coen Dexter |
| 2010-137 | 2010 |
Colorado City and Rye
| Pueblo | Dave Silverman |
| 2012-098 | 2011 |
South Republican SWA
| Yuma | Glenn Walbek |
| 2011-180 | 2011 |
Boulder
| Boulder | Rolando Garcia |
| 2012-008 | 2012 |
Boulder
| Boulder | Maggie Boswell |
| 2012-188 | 2012 |
Holyoke
| Phillips | Steven Mlodinow |
| 2013-096 | 2012 |
my back yard
| Douglas | Glenn Walbek |
| 2014-166 | 2013 |
Fort Collins
| Larimer | Sean Walters |
| 2013-232 | 2013 |
Flagler Reservoir State Wildlife Area
| Kit Carson | Mark Peterson |
| 2014-164 | 2014 |
Longmont
| Boulder | Bryan Guarente |
| 2014-167 | 2014 |
322 Hilltop Parkway, Steamboat Springs, C)
| Routt | David Moulton |
| 2014-175 | 2014 |
Greeley
| Weld | Steven Mlodinow |
| 2014-178 | 2014 |
Rocky Ford State Wildlife Area
| Otero | Brandon K. Percival |
| 2016-005 | 2016 |
Fountain Creek Regional Park
| El Paso | Ted Floyd, Robb Hinds, Bill Maynard |
| 2019-013 | 2019 |
Ft. Collins--Keirn Residence
| Larimer | Kevin Keirn |