Gretchen Johnson has 5 recorded races from Old Greenwich, Connecticut, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-01-25 | Life Time Miami Marathon & Half presented by FP Movement Half Marathon | Half Marathon | 2:40:32 | 10468 |
| 2025-02-02 | Life Time Miami Marathon & Half presented by FP Movement Half Marathon | Half Marathon | 2:50:05 | 10710 |
| 2024-01-28 | 2024 Life Time Miami Marathon & Half Half Marathon | Half Marathon | 2:30:06 | 7428 |
| 2023-01-28 | Life Time Miami Marathon & Half Half Marathon | Half Marathon | 2:31:02 | 7602 |
| 2022-02-06 | Life Time Miami Marathon & Half Marathon | Half Marathon | 2:30:11 | 6196 |