| 826 | 14 Jun 26 | Trinona Triathlon and Duathlon | Olympic/Sprint Duathlon/Sprint Triathlon | Winona, MN |
| 827 | 04 Apr 26 | Trinity River Hop | 5K/10K | Fort Worth, TX |
| 828 | 07 Feb 26 | Trinidad to Clam Beach Run | 3M/5.8M/8.8M | Trinidad, CA |
| 829 | 07 Mar 26 | Trillium Trek Trail Run | 5K/10K/13.1M | Gainesville, GA |
| 830 | 16 May 26 | Trillium Spring 5K | 5K | Canton, MA |
| 831 | 15 Mar 26 | TriGators Campus 5K | Sprint/supersprint triathlon/supersprint triathlon relay | Gainesville, FL |
| 832 | 10 May 26 | Tricia Davis 5K | 5K | Washington, DC |
| 833 | 02 May 26 | TriByKnight Triathlon | Sprint Triathlon | Waverly, IA |
| 834 | 30 May 26 | Triangle Sprint & Mini-Sprint | Sprint/Sprint Triathlon Relay/supersprint triathlon | New Hill, NC |
| 835 | 07 Mar 26 | Tri45 - Gaylord All Outdoors Winter Triathlon | Sprint Triathlon | Frederic, MI |
| 836 | 13 Jun 26 | Tri2BeatMS Kids Triathlon | youth triathlon | Chillicothe, IL |
| 837 | 07 Mar 26 | Tri-U-Mah Indoor Triathlon | indoor triathlon | Minneapolis, MN |
| 838 | 06 Jun 26 | Tri-State New York Spartan | 1K/5K/10K | Bethel, NY |
| 839 | 25 Apr 26 | Tri-State New Jersey Spartan Event | 1K/21K/50K | Vernon, NJ |
| 840 | 06 Jun 26 | Tri-Shark Classic | Sprint Duathlon/Sprint Triathlon | Hudson, IL |