| 15376 | 28 Sep 25 | 2025 Kids Mission Bay Triathlon Prerace Clinic . . | triathlon | San Diego, CA |
| 15377 | 25 Oct 25 | 2025 Kids Cancer Foundation 5K Walk/Run in memory of Sebastian | 5K | Royal Palm Beach, FL |
| 15378 | 04 Oct 25 | 2025 Kickapoo Reserve Dam Challenge Triathlon | triathlon | La Farge, WI |
| 15379 | 14 Dec 25 | 2025 Key West Triathlon | triathlon | Key West, FL |
| 15380 | 12 Oct 25 | 2025 Keswick 5k/10k | 10K/5K | Keswick, VA |
| 15381 | 11 Oct 25 | 2025 Kenilworth 5k/10k/Half | 10K/13.1/5K | Washington, DC |
| 15382 | 09 Nov 25 | 2025 Kendra's Race ?? . . | triathlon | Santa Barbara, CA |
| 15383 | 28 Sep 25 | 2025 Kenai River Marathon | 5K | Kenai, AK |
| 15384 | 18 Oct 25 | 2025 Kegs and Eggs Halloween 5k - October 18 | 5K | Manheim, PA |
| 15385 | 06 Sep 25 | 2025 Karen Stevens Memorial Kids Triathlon | triathlon | Severna Park, MD |
| 15386 | 14 Sep 25 | 2025 Josh Billings Triathlon | triathlon | Lenox, MA |
| 15387 | 13 Dec 25 | 2025 Jingle Jog 5k | 5K | Waurika, OK |
| 15388 | 27 Sep 25 | 2025 Jailbreak Triathlon | triathlon | Columbia, TN |
| 15389 | 01 Nov 25 | 2025 Jack T. Farrar, Jr. "Fill the Shoes" 5K | 5K | Alexandria, VA |
| 15390 | 28 Sep 25 | 2025 J-Hawk Latebird Triathlon | triathlon | Whitewater, WI |