| 2371 | 30 May 26 | Colorado Springs Spartan Trifecta | 1K/5K/21K/50K | Colorado Springs, CO |
| 2372 | 06 Jun 26 | Colorado Triathlon | Olympic/Olympic Duathlon/Sprint Triathlon | Boulder, CO |
| 2373 | 10 May 26 | Colorado Women's Classic - Westminster | 5K/10K | Westminster, CO |
| 2374 | 10 May 26 | Colorado Women's Classic 10 Miler | 10K/10M/5K | Westminster, CO |
| 2375 | 25 Apr 26 | Colorfest Fun Run 5K | 5K | Alamogordo, NM |
| 2376 | 18 Apr 26 | Colors for Care 5K | 5K | Madisonville, KY |
| 2377 | 08 Aug 26 | Colors of Cancer Memorial 5K Color Run | 5K | Toronto, OH |
| 2378 | 09 May 26 | Colterris Wine Run 5K | 5K | Palisade, CO |
| 2379 | 19 Jul 26 | Columbia Association Kids Triathlon | youth triathlon | Columbia, MD |
| 2380 | 20 Jun 26 | Columbia Basin K9 Run for the Paws | 5K | Moses Lake, WA |
| 2381 | 19 Apr 26 | Columbia Donut Mile | 1M | Columbia, MD |
| 2382 | 14 Jun 26 | Columbia River Half Iron | halfiron triathlon | Vantage, WA |
| 2383 | 07 Aug 26 | Columbia River Triathlon | 5K/10K | Vancouver, WA |
| 2384 | 12 Apr 26 | Columbia Sprint Duathlon | Sprint Duathlon/youth duathlon | Columbia, MD |
| 2385 | 14 Jun 26 | Columbia Triathlon | Sprint/supersprint triathlon | Columbia, MD |