John Blackwell has 3 recorded races from Boulder, CO.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-09-28 | Boulderthon Half Marathon | Half Marathon | 1:50:21 | 873 |
| 2024-09-29 | Boulderthon Half Marathon | Half Marathon | 1:40:28 | 267 |
| 2023-10-08 | Boulderthon Half Marathon | Half Marathon | 1:47:15 | 428 |