| 556 | 31 May 26 | 2026 Silver Serpent Multisport Festival - Sunday Events | triathlon | Silver Lake, NY |
| 557 | 02 May 26 | 2026 Siouxperman Triathlon | triathlon | Sioux Center, IA |
| 558 | 18 Apr 26 | 2026 Sip & Stride 5k/10k | 10K/5K | Louisa, VA |
| 559 | 04 Oct 26 | 2026 SKECHERS Hot Chocolate Run - Denver | 5K | Denver, CO |
| 560 | 18 Apr 26 | 2026 Sky Rim Duathlon | triathlon | Durango, CO |
| 561 | 11 Apr 26 | 2026 Smithfield Sprint Triathlon | triathlon | Smithfield, VA |
| 562 | 08 Mar 26 | 2026 Smoketown Brewery 5k/10k | 10K/5K | Brunswick, MD |
| 563 | 03 Jan 26 | 2026 Snowball Dash 5k/10k | 10K/5K | Berryville, VA |
| 564 | 23 May 26 | 2026 Soldier Field 10 | 10K | Chicago, IL |
| 565 | 21 Feb 26 | 2026 South Davis Indoor Triathlon - February | triathlon | Bountiful, UT |
| 566 | 14 Mar 26 | 2026 South Davis Indoor Triathlon - March | triathlon | Bountiful, UT |
| 567 | 03 Jun 26 | 2026 Southern Tier Triathlon Club (STTC) Summer Tri Series #1 | triathlon | Cassadaga, NY |
| 568 | 01 Aug 26 | 2026 Sportsplex Tri for Kids | triathlon | Opelika, AL |
| 569 | 19 Apr 26 | 2026 Spring Cleaning 5k/10k/Half | 10K/13.1/5K | Washington, DC |
| 570 | 24 May 26 | 2026 Spring Georgetown Memorial 5k/Half | 13.1/5K | Washington, DC |