Colin Johnstone has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2026 | Marathon | 2:57:24 | 2706 | |
| TCS London Marathon 2025 | Marathon | 2:57:27 | 2436 | |
| TCS London Marathon 2023 | Marathon | 2:59:01 | 2810 | |
| TCS London Marathon 2022 | Marathon | 3:03:31 | 2195 |