| 13816 | 28 Mar 26 | 2026 Dare to Tri - Fort Gordon | triathlon | Fort Eisenhower, GA |
| 13817 | 28 Mar 26 | 2026 Culpeper Airport 5k | 5K | Culpeper, VA |
| 13818 | 31 May 26 | 2026 Crooked Run Valley 5k & 10k | 10K/5K | Delaplane, VA |
| 13819 | 26 Jul 26 | 2026 Crescent City Triathlon | triathlon | Crescent, CA |
| 13820 | 15 Feb 26 | 2026 Coronado Valentine's Day 10K, 5K and 1 Mile Fun Run/Walk | 5K/10K | Coronado, CA |
| 13821 | 11 Jul 26 | 2026 Cool Sommer Mornings Triathlon Series #2 | triathlon | Clermont, FL |
| 13822 | 13 Jun 26 | 2026 Cool Sommer Mornings Tri Series #1 | triathlon | Clermont, FL |
| 13823 | 28 Mar 26 | 2026 Consider How the Wildflowers Grow 1M 5K 10K 13.1 26.2 | Virtual | Mobile, AL |
| 13824 | 16 Feb 26 | 2026 Commander-in-Chief Chase 5k/10k | 10K/5K | Spotsylvania, VA |
| 13825 | 14 Jun 26 | 2026 Columbia River Half Iron | triathlon | Vantage, WA |
| 13826 | 12 Apr 26 | 2026 Columbia Gateway Duathlon | triathlon | Columbia, MD |
| 13827 | 06 Jun 26 | 2026 Colorado Triathlon | triathlon | Boulder, CO |
| 13828 | 20 Jun 26 | 2026 Clemson Triathlon | triathlon | Seneca, SC |
| 13829 | 13 Jun 26 | 2026 Claude Moore 5k & 10k | 10K/5K | Sterling, VA |
| 13830 | 27 Mar 26 | 2026 CLASH Miami Triathlon - Sunday Events | triathlon | Homestead, FL |