| 10726 | 26 Jul 26 | 2026 Crescent City Triathlon | triathlon | Crescent, CA |
| 10727 | 29 Nov 26 | 2026 Cranberry Crawl Turkey Trot 5k/5-Miler/10M | 10M/5K/5M | Washington, DC |
| 10728 | 11 Jul 26 | 2026 Cool Sommer Mornings Triathlon Series #2 | triathlon | Clermont, FL |
| 10729 | 13 Jun 26 | 2026 Cool Sommer Mornings Tri Series #1 | triathlon | Clermont, FL |
| 10730 | 14 Jun 26 | 2026 Columbia River Half Iron | triathlon | Vantage, WA |
| 10731 | 12 Apr 26 | 2026 Columbia Gateway Duathlon | triathlon | Columbia, MD |
| 10732 | 06 Jun 26 | 2026 Colorado Triathlon | triathlon | Boulder, CO |
| 10733 | 02 Aug 26 | 2026 Coca Strong 5k/10k Hope in Every Step | 10K/5K | Valley Cottage, NY |
| 10734 | 20 Jun 26 | 2026 Clemson Triathlon | triathlon | Seneca, SC |
| 10735 | 13 Jun 26 | 2026 Claude Moore 5k & 10k | 10K/5K | Sterling, VA |
| 10736 | 02 May 26 | 2026 Citrus Kids Triathlon - Bicentennial Park | triathlon | Crystal River, FL |
| 10737 | 09 May 26 | 2026 Cinco de Miler | 1M | Chicago, IL |
| 10738 | 02 May 26 | 2026 Cinco de Mayo 5k | 5K | Haymarket, VA |
| 10739 | 25 Jul 26 | 2026 Christmas in July 5k & Half | 13.1/5K | Washington, DC |
| 10740 | 24 Dec 26 | 2026 Christmas Eve 5k/10k | 10K/5K | Washington, DC |