| 2881 | 01 Aug 26 | College of DuPage Alumni 5K | 5K | Glen Ellyn, IL |
| 2882 | 02 May 26 | Collegiate Peaks Trail Run | 25M | Buena Vista, CO |
| 2883 | 01 Aug 26 | Collin Cares Glow with the Flow Twilight Run 5K | 5K | Medina, OH |
| 2884 | 14 Mar 26 | Collingswood HS Athletic Hall of Fame 5K | 5K | Collingswood, NJ |
| 2885 | 04 Apr 26 | Collinsville Hills 5K and Fun Run | 1M/5K | Collinsville, OK |
| 2886 | 07 Aug 26 | Collinsville Moonlight 5K & Fun Run | 1M/5K | Collinsville, OK |
| 2887 | 28 Mar 26 | Colon Cancer Awareness 5K/3K | 3K/5K | Hermitage, MO |
| 2888 | 06 Jun 26 | Colon Screening for LIFE 5K | 5K | Evansville, IN |
| 2889 | 21 Jun 26 | Colonial Beach Triathlon | Olympic/Sprint Triathlon/Sprint Triathlon Relay | Colonial Beach, VA |
| 2890 | 12 Apr 26 | Colonial School District Education Foundation 5K | 5K | Plymouth Meeting, PA |
| 2891 | 05 May 26 | Colonial Summer Fun Run Series - Abington | 3.3M | Abington, MA |
| 2892 | 06 May 26 | Colonial Summer Fun Run Series - Brockton | 3.8M | Brockton, MA |
| 2893 | 04 May 26 | Colonial Summer Fun Run Series - Raynham | 3.3M | Raynham, MA |
| 2894 | 04 Apr 26 | Color Hop 5K | 5K | Punta Gorda, FL |
| 2895 | 14 Mar 26 | Color Me Green 5K | 5K | Clovis, CA |