| 1261 | 12 Sep 26 | Black Sheep 5K and 1 Mile Run | 1M/5K | Fort Smith, AR |
| 1262 | 12 Sep 26 | Black Squirrel Half Marathon | 13.1M | Bellvue, CO |
| 1263 | 23 May 27 | Black Squirrel Triathlon | Sprint Triathlon | Council Bluffs, IA |
| 1264 | 30 Jan 27 | Black Toe Run | 12H relay/12H run/24H | Watertown, TN |
| 1265 | 27 Nov 26 | Black Toenail Friday Half Marathon & 7.5 Mile | 7.5M/13.1M | Commerce, MI |
| 1266 | 17 Oct 26 | Black-Eyed Pea 5K | 1M/5K | Athens, TX |
| 1267 | 20 Mar 27 | Blackbeard's Revenge 100 Ultra & Relay | 100K/100M | Corolla, NC |
| 1268 | 10 Oct 26 | Blackfoot Tater Trot | 5K/10K | Blackfoot, ID |
| 1269 | 07 Sep 26 | Blackland Triathlon and Blackland Youth Tri | Sprint Triathlon/Sprint Triathlon Relay/youth aquathon/youth triathlon | Plano, TX |
| 1270 | 19 Sep 26 | Blacklight Run | DFW | 5K | Fort Worth, TX |
| 1271 | 26 Sep 26 | Blacklight Run | Phoenix | 5K | Phoenix, AZ |
| 1272 | 26 Nov 26 | Blacksburg Turkey Trot | 5K | Blacksburg, VA |
| 1273 | 26 Sep 26 | Blairsville Extreme Adventure Race | 10H adventure race | Blairsville, GA |
| 1274 | 18 Sep 26 | Blake's Haunted Orchard 5K Run/Walk | 5K | Armada, MI |
| 1275 | 21 Nov 26 | Blake's Holiday Hustle 5K | 5K | Armada, MI |