Searched 21 events from September 17, 2005 to September 20, 2025
| Name | Gender | From | Finish Count |
|---|---|---|---|
| David Jones | Male | 2 | |
| Malia Jones | Female | Boulder, CO | 1 |
| Zack Jordan | Male | Longmont, CO | 1 |
| Jessica Jortberg | Female | 1 | |
| Lauren Jortberg | Female | 2 | |
| Rich Jortberg | Male | 1 | |
| Ben Kadlec | Male | Boulder, CO | 1 |
| Sara Kadlec | Female | Boulder, CO | 1 |
| Jason Kaminski | Male | 1 | |
| Sean Karls | Male | 1 | |
| Brian Kasid | Male | Superior, CO | 1 |
| Shaun Katona | Male | 1 | |
| Raphael Kaubruegger | Male | Boulder, CO | 1 |
| Jacob Kaufman-Osborn | Male | Boulder, CO | 6 |
| Simon Kearns | Male | Mancos, CO | 3 |
| Dhruv Kedar | Male | Boulder, CO | 5 |
| Thomas David Kehoe | Male | 7 | |
| Kenyon Kellogg | Male | Boston, MA | 1 |
| Paget Kellogg | Male | Boulder, CO | 1 |
| Nickie Kelly | Female | 1 | |
| Owen Kempf | Male | Denver, CO | 1 |
| David Kennedy | Male | Boulder, CO | 3 |
| Joe Kennedy | Male | Boulder, CO | 1 |
| Tatiana Kennedy | Female | Boulder, CO | 1 |
| Tanner Kent | Male | Boulder, CO | 1 |
| Emma Kenyon | Female | Westminster, CO | 1 |
| Nathanael Kerber | Male | Eldorado Springs, CO | 1 |
| Eli Keyes | Male | Milwaukee, WI | 1 |
| Tyler Keyworth | Male | Denver, CO | 1 |
| Heather Kilcoyne | Female | Louisville, CO | 1 |
| Jamie Kilcoyne | Male | Louisville, CO | 3 |
| Madison Kile | Female | Boulder, CO | 1 |
| Jason Killgore | Male | Boulder, CO | 3 |
| Yukiko Kimura | Female | 1 | |
| Kirsten Kindt | Female | 3 | |
| Bill Kinter | Male | Boulder, CO | 2 |
| Ryan Kircher | Male | Lakewood, CO | 2 |
| TJ Kirk | Male | Boulder, CO | 1 |
| Corey Kline | Male | Boulder, CO | 5 |
| Laura Kline | Female | Boulder, CO | 1 |
| Kiara Knapp | Female | Boulder, CO | 1 |
| Brenton Knight | Male | Westminster, CO | 2 |
| Tate Knight | Male | Boulder, CO | 4 |
| Benjamin Knurr | Male | 2 | |
| Bryce Knutson | Male | Boulder, CO | 2 |
| Rey Koki | Female | Boulder, CO | 6 |
| Daniel Kopelove | Male | 2 | |
| Colin Korbisch | Male | Boulder, CO | 1 |
| Joseph Kosenski | Male | 1 | |
| Olga Koshkina | Female | 1 |