| 2566 | 09 May 26 | Crooked Lake Trail Run (2.3 Mile | 5K | 10K) @ Independence County Oaks Park (May 9th, 2026) | 10K/5K | Clarkston, MI |
| 2567 | 31 May 26 | Crooked Run Valley 5K/10K | 5K/10K | Delaplane, VA |
| 2568 | 17 May 26 | Cross Bay Tri/Duathlon | Sprint Duathlon/Sprint Triathlon/Sprint Triathlon Relay/sprint duathlon relay | Rockaway Beach, NY |
| 2569 | 28 Jun 26 | Cross Country on the Farm | 5K | Derwood, MD |
| 2570 | 17 Jul 26 | Cross Country Sundown Showdown | 5K | Carterville, IL |
| 2571 | 21 Jul 26 | Cross Country Team Challenge | 5K | Grand Rapids, MI |
| 2572 | 09 May 26 | Crossover Half | 13.1M | Paradise, UT |
| 2573 | 09 May 26 | Crossroads Community Care 5K | 5K | South Lyon, MI |
| 2574 | 12 Apr 26 | Crossroads Half Marathon | 13.1M | Metuchen, NJ |
| 2575 | 13 Jun 26 | Crossroads Trail Run & Walk | 2K/5K/10K | Sturgeon Bay, WI |
| 2576 | 26 Nov 26 | Crossroads Turkey Trot | 10K/1K/5K | Helena, MT |
| 2577 | 04 Jul 26 | Crown City Classic | 5K/12K | Coronado, CA |
| 2578 | 18 Apr 26 | Crown Run 5K | 5K | Florence, SC |
| 2579 | 27 Jun 26 | Crown Z Trail Race | 5K/10K/13.1M | Scappoose, OR |
| 2580 | 30 May 26 | Crozet Volunteer Fire Department Firehouse 5K | 5K | Crozet, VA |