Searched 18 events from May 13, 2017 to May 10, 2025
| Name | Gender | From | Finish Count |
|---|---|---|---|
| Laura Oconnell | Female | Granby, CO | 1 |
| Laura O'Connell | Female | Evergreen, CO | 2 |
| Celeste O'connor | Female | Fort Collins, CO | 2 |
| Jesse O'Connor | Male | Manhattan Beach, CA | 1 |
| Quincy O'Connor | Male | Salt Lake City, UT | 1 |
| Jocelyn OConnor | Female | Longmont, CO | 1 |
| Heather O'Donnell | Female | Cheyenne, WY | 1 |
| Trisha Oeth | Female | Boulder, CO | 1 |
| Jitka O'farrell | Female | Lakewood, CO | 2 |
| Christine O'Gorman | Female | Westminster, CO | 1 |
| Brendan Ohara | Male | Fort Collins, CO | 1 |
| Mitch O'Hare | Male | Fort Collins, CO | 1 |
| Alma Olaechea | Female | Denver, CO | 1 |
| Katherine Oldberg | Female | Fort Collins, Co, CO | 1 |
| August Ollrich | Male | Longmont, CO | 1 |
| Gordon Olsen | Male | Littleton, CO | 2 |
| Josh Olsen | Male | Greeley, CO | 1 |
| Benjamin Olson | Male | Saint Louis, MO | 1 |
| Joy Olson | Female | Aspen, CO | 1 |
| Karina Olson | Female | Fort Collins, CO | 1 |
| Bradley Olwin | Male | Berthoud, CO | 3 |
| Katie Olwin | Female | Berthoud, CO | 1 |
| Nora O'Malley | Female | Broomfield, CO | 1 |
| Brad Opfer | Male | Fort Collins, CO | 2 |
| Camden Opfer | Male | Fort Collins, CO | 2 |
| Greg Opgenorth | Male | Westminster, CO | 1 |
| Benjamin Oppenheimer | Male | Boulder, CO | 1 |
| Tara Opsal | Female | Fort Collins, CO | 2 |
| Miguel Ordorica | Male | Omaha, NE | 1 |
| Mike Orth | Male | Loveland, CO | 2 |
| Hannah Osowski | Female | Colorado Springs, CO | 1 |
| Marianne Osteen | Female | Steamboat Springs, CO | 1 |
| Seth Otto | Male | Las Vegas, NV | 2 |
| Patrick Owen | Male | Denver, CO | 1 |
| Brent Owens | Male | Highlands Ranch, CO | 1 |
| Steven Pack | Male | Brooklyn, NY | 1 |
| Tatiana Padilla-Moore | Female | Erie, CO | 1 |
| Vince Paikowski | Male | Colorado Springs, CO | 1 |
| Braddley Pakish | Male | Fort Collins, CO | 1 |
| Neal Palles | Male | Longmont, CO | 2 |
| Brett Palm | Male | Longmont, CO | 1 |
| Robert Panas | Male | Boulder, CO | 1 |
| Hugo Pantigoso | Male | Fort Collins, CO | 1 |
| Amelia Pape | Female | Fort Collins, CO | 1 |
| Andrew Papke-Larson | Male | Windsor, CO | 1 |
| Mark Paquette | Male | Windsor, CO | 1 |
| Emma Paras | Female | Denver, CO | 2 |
| Mark Parish | Male | Denver, CO | 1 |
| Erin Park | Female | Vail, CO | 1 |
| Jill Parker | Female | Centennial, CO | 1 |