Cecilia O'Brien has 5 recorded races from Frederick, Maryland, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-05-02 | 2026 Frederick Running Festival Half Marathon | Half Marathon | 2:48:35 | 2464 |
| 2025-06-07 | 2025 Baltimore 10 Miler | 10 Mile | 2:05:16 | 1932 |
| 2025-05-03 | 2025 Frederick Running Festival Half Marathon | Half Marathon | 2:39:57 | 2048 |
| 2024-06-01 | 2024 Baltimore 10 Miler | 10 Mile | 2:00:06 | 2191 |
| 2024-05-04 | 2024 Frederick Running Festival Half Marathon | Half Marathon | 2:37:28 | 1986 |