Brenna Shanahan has 2 recorded races from Chicago, Illinois, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-09-28 | 2025 Life Time Chicago Half Marathon + 5K | Half Marathon | 2:37:56 | 6660 |
| 2023-05-21 | Life Time Chicago Spring Half & 10K Half Marathon | Half Marathon | 2:20:39 | 3144 |