| 19621 | 29 Nov 26 | 2026 Cranberry Crawl Turkey Trot 5k/5-Miler/10M | 10M/5K/5M | Washington, DC |
| 19622 | 11 Jul 26 | 2026 Cool Sommer Mornings Triathlon Series #2 | triathlon | Clermont, FL |
| 19623 | 13 Jun 26 | 2026 Cool Sommer Mornings Tri Series #1 | triathlon | Clermont, FL |
| 19624 | 14 Jun 26 | 2026 Columbia River Half Iron | triathlon | Vantage, WA |
| 19625 | 06 Jun 26 | 2026 Colorado Triathlon | triathlon | Boulder, CO |
| 19626 | 02 Aug 26 | 2026 Coca Strong 5k/10k Hope in Every Step | 10K/5K | Valley Cottage, NY |
| 19627 | 20 Jun 26 | 2026 Clemson Triathlon | triathlon | Seneca, SC |
| 19628 | 13 Jun 26 | 2026 Claude Moore 5k & 10k | 10K/5K | Sterling, VA |
| 19629 | 09 May 26 | 2026 Cinco de Miler | 1M | Chicago, IL |
| 19630 | 25 Jul 26 | 2026 Christmas in July 5k & Half | 13.1/5K | Washington, DC |
| 19631 | 24 Dec 26 | 2026 Christmas Eve 5k/10k | 10K/5K | Washington, DC |
| 19632 | 26 Jul 26 | 2026 Chisago Lakes Triathlon - Sunday | triathlon | Chisago, MN |
| 19633 | 07 Nov 26 | 2026 Chessie Trail Marathon, Half Marathon, 10K, 5K, & 26.2 Relay | 10K/13.1/26.2/5K/Relay | Lexington, VA |
| 19634 | 19 Sep 26 | 2026 Chelanathon | triathlon | Manson, WA |
| 19635 | 07 May 26 | 2026 Cerberus 3-Day Expedition Stage Race | triathlon | New Castle, VA |