| 556 | 14 Sep 25 | 2025 Tradewind Triathlon | triathlon | Kaneohe Bay, HI |
| 557 | 23 Nov 25 | 2025 Trail Blazer 10K - 5K | 5K/10K | Peoria, AZ |
| 558 | 28 Sep 25 | 2025 Treasure Island Triathlon, Duathlon, Aquabike, & Kayak Triathlon | triathlon | Point Pleasant, NJ |
| 559 | 13 Sep 25 | 2025 Tri Community Tri | triathlon | Pima, AZ |
| 560 | 13 Sep 25 | 2025 TRI PTC - Peachtree City Sprint Triathlon | triathlon | Peachtree, GA |
| 561 | 21 Sep 25 | 2025 Tri The Illini Triathlon | triathlon | Champaign, IL |
| 562 | 13 Sep 25 | 2025 Tri the Parks John Tanner 2 Sprint (Fall) | triathlon | Carrollton, GA |
| 563 | 18 Oct 25 | 2025 Tribe Fitness Challenge - Sawmill | triathlon | Hamilton, NJ |
| 564 | 05 Oct 25 | 2025 TriByLittleKnight Triathlon | triathlon | Waverly, IA |
| 565 | 18 Oct 25 | 2025 Trick or Tri at Merrill Ranch | triathlon | Florence, AZ |
| 566 | 06 Sep 25 | 2025 Triquest Triathlon | triathlon | Ludlow, VT |
| 567 | 05 Sep 25 | 2025 TriUtah Brineman Triathlon | triathlon | Syracuse, UT |
| 568 | 09 Sep 25 | 2025 Tuesday Night 5k #7 | 5K | Springfield, VA |
| 569 | 14 Oct 25 | 2025 Tuesday Night 5k #8 | 5K | Springfield, VA |
| 570 | 23 Nov 25 | 2025 Turkey Dri Tri ? | triathlon | Oak Brook, IL |