| 15991 | 31 Aug 25 | 2025 CRC Labor Day Weekend 10K & 5K | 5K/10K | Fort Worth, TX |
| 15992 | 30 Nov 25 | 2025 Cranberry Crawl Turkey Trot 5k/5-Miler/10M | 10K/13.1/5K | Washington, DC |
| 15993 | 14 Sep 25 | 2025 Craig Ranch McKinney Triathlon | triathlon | McKinney, TX |
| 15994 | 16 Aug 25 | 2025 Courage Triathlon . . | triathlon | Westwood, CA |
| 15995 | 16 Aug 25 | 2025 Countryside YMCA Kids Healthy Triathlon - Lebanon | triathlon | Lebanon, OH |
| 15996 | 18 Oct 25 | 2025 Coronado Heights Run | 5K/15K | Lindsborg, KS |
| 15997 | 10 Aug 25 | 2025 Cool Sommer Mornings Triathlon & 5K Series #3 | triathlon | Clermont, FL |
| 15998 | 14 Sep 25 | 2025 Cool Sommer Mornings Sprint Triathlon, Duathlon & 5K #4 | triathlon | Clermont, FL |
| 15999 | 09 Aug 25 | 2025 Columbia River Triathlon | triathlon | Vancouver, WA |
| 16000 | 08 Aug 25 | 2025 Columbia River Kids Triathlon & All Age Sunset Run 5K & 10K - Friday | triathlon | Vancouver, WA |
| 16001 | 20 Jul 25 | 2025 Columbia Association Kids Triathlon | triathlon | Columbia, MD |
| 16002 | 05 Oct 25 | 2025 Cohutta Triathlon | triathlon | Crandall, GA |
| 16003 | 02 Aug 25 | 2025 Cohasset Kids Triathlon | triathlon | Cohasset, MA |
| 16004 | 03 Aug 25 | 2025 Coca Strong 5k/10k Hope in Every Step | 10K/5K | Valley Cottage, NY |
| 16005 | 19 Jul 25 | 2025 Clear Lake Sprint and Olympic Triathlons | triathlon | Fremont, IN |