| 646 | 24 Jul 26 | 2026 TriMillennium Kids Triathlon - FRIDAY | triathlon | Grand Rapids, MI |
| 647 | 31 May 26 | 2026 TriRidgefield Triathlon & Duathlon | triathlon | Ridgefield, CT |
| 648 | 08 Aug 26 | 2026 TriUtah East Canyon Triathlon | triathlon | Morgan, UT |
| 649 | 11 Jul 26 | 2026 TriUtah Echo Triathlon | triathlon | Coalville, UT |
| 650 | 28 Jun 26 | 2026 TriWaco Triathlon | triathlon | Waco, TX |
| 651 | 01 Aug 26 | 2026 Try-A-Tri: Preston Nielson Memorial Triathlon Festival - SATURDAY ADULTS | triathlon | Blanding, UT |
| 652 | 28 Mar 26 | 2026 Tualatin River Run | 5K | Tualatin, OR |
| 653 | 08 Mar 26 | 2026 Tucson Shamrock Half Marathon / 10K / 5K | 5K/10K | Tucson, AZ |
| 654 | 10 Mar 26 | 2026 Tuesday Night 5k #1 | 5K | Annandale, VA |
| 655 | 25 Apr 26 | 2026 Tupelo Sprint Triathlon | triathlon | Tupelo, MS |
| 656 | 27 Jun 26 | 2026 Tupper Lake Tinman Triathlon | triathlon | Tupper Lake, NY |
| 657 | 08 Aug 26 | 2026 Twin Lakes Triathlon | triathlon | Manson, IA |
| 658 | 21 Mar 26 | 2026 Twisted Oak 4k/8k | 4k/8k | Boyce, VA |
| 659 | 16 May 26 | 2026 Two Twisted Posts Winery 5k/10k | 10K/5K | Purcellville, VA |
| 660 | 01 Feb 26 | 2026 UCI Zot Trot Reverse Triathlon | triathlon | Irvine, CA |