| 166 | 02 Aug 26 | 2026 Coca Strong 5k/10k Hope in Every Step | 10K/5K | Valley Cottage, NY |
| 167 | 06 Jun 26 | 2026 Colorado Triathlon | triathlon | Boulder, CO |
| 168 | 12 Apr 26 | 2026 Columbia Gateway Duathlon | triathlon | Columbia, MD |
| 169 | 14 Jun 26 | 2026 Columbia River Half Iron | triathlon | Vantage, WA |
| 170 | 13 Jun 26 | 2026 Cool Sommer Mornings Tri Series #1 | triathlon | Clermont, FL |
| 171 | 11 Jul 26 | 2026 Cool Sommer Mornings Triathlon Series #2 | triathlon | Clermont, FL |
| 172 | 29 Nov 26 | 2026 Cranberry Crawl Turkey Trot 5k/5-Miler/10M | 10M/5K/5M | Washington, DC |
| 173 | 26 Jul 26 | 2026 Crescent City Triathlon | triathlon | Crescent, CA |
| 174 | 31 May 26 | 2026 Crooked Run Valley 5k & 10k | 10K/5K | Delaplane, VA |
| 175 | 18 Apr 26 | 2026 Dash 4 Dignity 5k | 5K | Severn, MD |
| 176 | 16 May 26 | 2026 Dash Through the Dirt 5k/10k/Half | 10K/13.1/5K | Potomac, MD |
| 177 | 02 May 26 | 2026 Dash to Benefit 5K & Fun Run | 5K | Clarksville, TN |
| 178 | 12 Sep 26 | 2026 Dashing to Summer's End 5k/10k | 10K/5K | Alexandria, VA |
| 179 | 04 Oct 26 | 2026 DC Fall Classic 5k/Half | 13.1/5K | Washington, DC |
| 180 | 10 May 26 | 2026 DC Mother's Day 5k/10k | 10K/5K | Washington, DC |