Searched 20 events from September 17, 2005 to September 21, 2024
| Name | Gender | From | Finish Count |
|---|---|---|---|
| Sherry Madison | Female | 1 | |
| Lawrence Maggitti | Male | Boulder, CO | 1 |
| Sophia Mahoney | Female | Boulder, CO | 2 |
| Bob Main | Male | 2 | |
| Amanda Makowiecki | Female | Boulder, CO | 1 |
| Ryan Malarky | Male | Fort Collins, CO | 7 |
| Andy Malinky | Male | Broomfield, CO | 1 |
| Nicholas Malone | Male | Boulder, CO | 1 |
| Amelia Mandell | Female | Eldorado Springs, CO | 1 |
| Kishen Mangat | Male | Boulder, CO | 1 |
| Jacquie Mannhard | Female | Boulder, CO | 1 |
| Stephen Mannhard | Male | 1 | |
| Lisa Mansfield | Female | Niwot, CO | 1 |
| Amy Manson | Female | Superior, CO | 1 |
| Max Manson | Male | Superior, CO | 3 |
| Rachel Marbaker | Female | Boulder, CO | 2 |
| Nathan Marincic | Male | Boulder, CO | 1 |
| Heidi Marks | Female | 1 | |
| Arlo Marquez-Grap | Male | Boulder, CO | 1 |
| Jim Marsden | Male | 1 | |
| Nathan Marshall | Male | Denver, CO | 1 |
| Ryan Marsters | Male | Golden, CO | 4 |
| Stephanie Marsters | Female | Golden, CO | 1 |
| Marianna Martin | Female | Boulder, CO | 2 |
| Adam Massey | Male | 3 | |
| Jay Mathers | Male | 2 | |
| Chris Maulsby | Male | 9 | |
| Ryan Maulsby | Male | 3 | |
| Hilary Maybee | Female | 1 | |
| Jennifer Maybee | Female | 1 | |
| Mark Maybee | Male | 1 | |
| Karl Mayer | Male | Boulder, CO | 1 |
| Laura Mayo | Female | Boulder, CO | 1 |
| Mike McCabe | Male | Louisville, CO | 1 |
| Kevin McCall | Male | 1 | |
| Scott McCall | Male | 1 | |
| Trish McCarthy | Female | Boulder, CO | 4 |
| Zach McCarthy | Male | Boulder, CO | 1 |
| Jeff McClenahan | Male | 1 | |
| Murphy McCormick | Female | 1 | |
| Ailish McDonald | Female | 1 | |
| Liam McDonald | Male | 3 | |
| Anne McDonough | Female | 1 | |
| Sean McDonough | Male | Denver, CO | 1 |
| Áedan McFall | Male | Boulder, CO | 1 |
| Adam McFarren | Male | 1 | |
| Mark McGaughey | Male | 2 | |
| Frank McGill | Male | 1 | |
| Laura McGinley | Female | 3 | |
| Jason McGlaughlin | Male | 1 |