| 436 | 06 Sep 25 | 2025 Finger Lakes Youth Triathlon - Saturday . . | triathlon | Canandaigua, NY |
| 437 | 22 Mar 25 | 2025 Firefighter Sunrise Run | 5K/10K | Quartzsite, AZ |
| 438 | 04 Jul 25 | 2025 Fireworks 5k/10k | 10K/5K | Fairfax Station, VA |
| 439 | 26 Jul 25 | 2025 First Responders - Bring in the Backup Triathlon | triathlon | Northwood, IA |
| 440 | 14 Jun 25 | 2025 First Try Triathlon | triathlon | Linden, MI |
| 441 | 17 May 25 | 2025 Fishers Sprint Triathlon | triathlon | Fishers, IN |
| 442 | 10 May 25 | 2025 Flater's Triple-R-Triathlon | triathlon | Holcombe, WI |
| 443 | 12 Jul 25 | 2025 Flatland Cup Junior Draft Legal Triathlon - SATURDAY EVENTS | triathlon | West Des Moines, IA |
| 444 | 13 Jul 25 | 2025 Flatland Cup Triathlon - Sunday | triathlon | West Des Moines, IA |
| 445 | 12 Apr 25 | 2025 Flora-Bama Mullet Man Triathlon | triathlon | Pensacola, FL |
| 446 | 10 May 25 | 2025 Fly By Night Duathlon . . | triathlon | Watkins Glen, NY |
| 447 | 10 May 25 | 2025 Folsom Lake International Triathlon - Saturday . . | triathlon | Granite Bay, CA |
| 448 | 11 May 25 | 2025 Folsom Lake Triathlon - Sunday Events . . | triathlon | Granite Bay, CA |
| 449 | 26 Jul 25 | 2025 Folsom Swim Run | triathlon | Folsom, CA |
| 450 | 13 Sep 25 | 2025 Fontana Triathlon | triathlon | Fontana, WI |