| 2401 | 04 Apr 26 | Crystal Coast Cancer Rehab Center 5K Run | 5K | Beaufort, NC |
| 2402 | 02 May 26 | Crystal Coast Run/Walk for Autism | 5K | Morehead, NC |
| 2403 | 13 Dec 25 | Crystal Cove Trail Run | 6K/15K | Newport Beach, CA |
| 2404 | 09 May 26 | Crystal Lake Ski and Outdoor Center Trail Race | 5K/25K | Hughesville, PA |
| 2405 | 18 Jan 26 | Crystal Springs (Winter) Trail Run | 8K/13.1M/35K/26.2M/50K | Woodside, CA |
| 2406 | 22 Apr 26 | CUIMC Team Relay Marathon at The Armory | 26.2M | New York, NY |
| 2407 | 24 Apr 26 | Cuke Patch 5K | 5K | Mount Olive, NC |
| 2408 | 18 Apr 26 | Cumberland County Historical Running Festival | 1M/5K/10K | Greenwich, NJ |
| 2409 | 28 Feb 26 | Cummins Falls Marathon | 5K/10K/13.1M/26.2M | Cookeville, TN |
| 2410 | 12 Apr 26 | Cunningham Creek Wine Run 5K | 5K | Palmyra, VA |
| 2411 | 14 Feb 26 | Cupcake Chase 5K | 5K | Phoenix, AZ |
| 2412 | 16 Feb 26 | Cupid Chase 5k, 10k, 15k, Half Marathon | 5K/10K/15K | Long Beach, CA |
| 2413 | 16 Feb 26 | Cupid Chase Half Marathon | 5K/10K/15K/13.1M | Long Beach, CA |
| 2414 | 15 Feb 26 | Cupid Dash 5k, 10k, 15k, Half Marathon | 5K/10K/15K | Long Beach, CA |
| 2415 | 15 Feb 26 | Cupid Dash Half Marathon | 5K/10K/15K/13.1M | Long Beach, CA |