| 286 | 29 Sep 25 | 2025 Center of the Nation Series - Day 1 (WY) | 5K/10K | Cheyenne, WY |
| 287 | 30 Sep 25 | 2025 Center of the Nation Series - Day 2 (CO) | 5K/10K | Sterling, CO |
| 288 | 01 Oct 25 | 2025 Center of the Nation Series - Day 3 (NE) | 5K/10K | Chadron, NE |
| 289 | 02 Oct 25 | 2025 Center of the Nation Series - Day 4 (SD) | 5K/10K | Belle Fourche, SD |
| 290 | 03 Oct 25 | 2025 Center of the Nation Series - Day 5 (ND) | 5K/10K | Bowman, ND |
| 291 | 04 Oct 25 | 2025 Center of the Nation Series - Day 6 (MT) | 5K/10K | Baker, MT |
| 292 | 19 Jul 25 | 2025 Cereal City Triathlon & Duathlon | triathlon | Battle Creek, MI |
| 293 | 19 Jul 25 | 2025 Challenge New Jersey State Triathlon - Sprint Saturday | triathlon | West Windsor, NJ |
| 294 | 19 Jul 25 | 2025 Charles M. Schulz-Sonoma County Airport Napa to Sonoma Wine Country Half Marathon & Rosé 5K | 5K | Napa, CA |
| 295 | 15 Jun 25 | 2025 Charleston Sprint Triathlon Series Race 1 | triathlon | Charleston, SC |
| 296 | 22 Jun 25 | 2025 Chattanooga Waterfront Triathlon | triathlon | Chattanooga, TN |
| 297 | 26 Jul 25 | 2025 Chesaning Chamber of Commerce Dry-Tri | triathlon | Chesaning, MI |
| 298 | 25 Oct 25 | 2025 Chessie Trail Marathon, Half Marathon, 10K, 5K, & 26.2 Relay | 10K/13.1/26.2/5K | Lexington, VA |
| 299 | 21 Jun 25 | 2025 Chesterfield Youth Triathlon | triathlon | Chesterfield, MO |
| 300 | 23 Aug 25 | 2025 Chicago Triathlon (Sunday) | triathlon | Chicago, IL |