Searched 21 events from September 17, 2005 to September 20, 2025
| Name | Gender | From | Finish Count |
|---|---|---|---|
| Chris Siron | Male | Longmont, CO | 1 |
| Steve Sirotkin | Male | 1 | |
| Sara Sisun | Female | Boulder, CO | 1 |
| Alexis Sitchler | Female | 1 | |
| Rosie Skovron | Female | Breckenridge, CO | 2 |
| Karen Smidt | Female | Brighton, CO | 5 |
| Chris Smith | Male | Boulder, CO | 1 |
| Darren Smith | Male | Boulder, CO | 3 |
| Dave Smith | Male | 3 | |
| Ellie Smith | Female | Boulder, CO | 1 |
| Joe Smith | Male | Boulder, CO | 1 |
| Joseph Smith | Male | Boulder, CO | 1 |
| Kevin Smith | Male | Lafayette, CO | 11 |
| Kieran Smith | Male | Boulder, CO | 1 |
| Michele Smith | Female | Lafayette, CO | 2 |
| Zach Smith | Male | Golden, CO | 1 |
| Linda Smollen | Female | 1 | |
| Dan Snyder | Male | Louisville, CO | 7 |
| Deborah Snyder | Female | Louisville, CO | 3 |
| Philip Snyder | Male | Denver, CO | 1 |
| Scarlett Snyder | Female | Louisville, CO | 1 |
| Stella Snyder | Female | Louisville, CO | 1 |
| Tor Snyder | Male | Louisville, CO | 2 |
| Shana Solomon | Female | Boulder, CO | 5 |
| Madaleine Sorkin | Female | 1 | |
| Marek Sotola | Male | Boulder, CO | 5 |
| Sarah Spaulding | Female | 1 | |
| Joby Spencer | Male | 1 | |
| Matthew Spergel | Male | New York, NY | 1 |
| Jen Spolnik | Female | 1 | |
| Ondrej Sramek | Male | 1 | |
| Peter Stamborski | Male | 1 | |
| Vanessa Stamborski | Female | 1 | |
| Tessa Stamper | Female | 1 | |
| Matthew Stasiukevicius | Male | Boulder, CO | 1 |
| Katie Steinberg | Female | 1 | |
| Ren Stengel | Female | Boulder, CO | 1 |
| John Sterrett | Male | Boulder, CO | 4 |
| Michelle Stoll | Female | Boulder, CO | 1 |
| Justin St. Onge | Male | Boulder, CO | 1 |
| Adam St.Pierre | Male | Boulder, CO | 3 |
| Martha Strain | Female | 1 | |
| Todd Straka | Male | 1 | |
| Matthew Straney | Male | 1 | |
| Rick Stubbs | Male | 3 | |
| Bobby Stucky | Male | 1 | |
| Alexander Stypula | Male | Eldorado Springs, CO | 1 |
| Nora Su | Female | Mountain View, CA | 1 |
| Shay Subramanian | Male | Boulder, CO | 1 |
| Marcel Such | Male | Lyons, CO | 1 |