| 361 | 18 Oct 25 | 2025 Kegs and Eggs Halloween 5k - October 18 | 5K | Manheim, PA |
| 362 | 28 Sep 25 | 2025 Kenai River Marathon | 5K | Kenai, AK |
| 363 | 09 Nov 25 | 2025 Kendra's Race ?? . . | triathlon | Santa Barbara, CA |
| 364 | 11 Oct 25 | 2025 Kenilworth 5k/10k/Half | 10K/13.1/5K | Washington, DC |
| 365 | 12 Oct 25 | 2025 Keswick 5k/10k | 10K/5K | Keswick, VA |
| 366 | 14 Dec 25 | 2025 Key West Triathlon | triathlon | Key West, FL |
| 367 | 04 Oct 25 | 2025 Kickapoo Reserve Dam Challenge Triathlon | triathlon | La Farge, WI |
| 368 | 25 Oct 25 | 2025 Kids Cancer Foundation 5K Walk/Run in memory of Sebastian | 5K | Royal Palm Beach, FL |
| 369 | 16 Aug 25 | 2025 Kids Day at the Boston Tri - SATURDAY | triathlon | Boston, MA |
| 370 | 28 Sep 25 | 2025 Kids Mission Bay Triathlon Prerace Clinic . . | triathlon | San Diego, CA |
| 371 | 24 Aug 25 | 2025 Kids Tri For Kids - Greenwood Event | triathlon | Greenwood, IN |
| 372 | 21 Sep 25 | 2025 Kiel Raider Nation Triathlon | triathlon | Kiel, WI |
| 373 | 17 Aug 25 | 2025 Kingsbury Club Youth Triathlon | triathlon | Medfield, MA |
| 374 | 27 Sep 25 | 2025 Knights Fury Duathlon | triathlon | Honeoye Falls, NY |
| 375 | 28 Sep 25 | 2025 Knights Gambit 5k/1.5M | 1M/5K | Charlottesville, VA |