| 136 | 19 Jul 26 | 2026 Cal Tri Williamsburg | triathlon | Williamsburg, VA |
| 137 | 17 May 26 | 2026 Caledon 5k/10k | 10K/5K | King George, VA |
| 138 | 19 Dec 26 | 2026 Candy Cane 5k/10k | 10K/5K | Alexandria, VA |
| 139 | 31 May 26 | 2026 Capitol City Chase 5k/10k/Half | 10K/13.1/5K | Washington, DC |
| 140 | 16 May 26 | 2026 Capt. Sisson Memorial 5K Run to Extinguish Firefighter Cancer | 5K | Fairfax Station, VA |
| 141 | 02 May 26 | 2026 Carderock 5k/10k/Half | 10K/13.1/5K | Potomac, MD |
| 142 | 06 Sep 26 | 2026 Carderock Charge 5k/10k/Half | 10K/13.1/5K | Potomac, MD |
| 143 | 12 Apr 26 | 2026 Care Packages at Carderock 5k/10k/Half | 10K/13.1/5K | Potomac, MD |
| 144 | 25 Apr 26 | 2026 CASA Superhero's 5k Run & Walk | 5K | Laredo, TX |
| 145 | 03 Oct 26 | 2026 Castle Creek Triathlon | triathlon | Morristown, AZ |
| 146 | 14 Nov 26 | 2026 Catalina Island Half Marathon and 10K | 10K | Avalon, CA |
| 147 | 11 Apr 26 | 2026 Cedar Creek SPRING Duathlon | triathlon | Seaford, NY |
| 148 | 26 Sep 26 | 2026 Cedar Mountain Rally 5k/10k/1M | 10K/1M/5K | Culpeper, VA |
| 149 | 28 Sep 26 | 2026 Center of the Nation Series - Day 1 (WY) | 5K/10K | Cheyenne, WY |
| 150 | 29 Sep 26 | 2026 Center of the Nation Series - Day 2 (CO) | 5K/10K | Sterling, CO |