Margaret Rennix has 3 recorded races from Cambridge, Massachusetts, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-10-05 | Guthrie Wineglass Marathon, Wegmans Wineglass Half Marathon & Williams Toyota Wineglass 5K | 3:31:26 | 422 | |
| 2023-10-07 | SouthCoast Wind Cape Cod Marathon Weekend Half Marathon | 1:44:39 | 155 | |
| 2023-05-28 | The M&T Bank Vermont City Marathon & Relay | 3:41:39 | 273 |