| David Harning's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Quad Rock 2023 (Quad Rock 50) | Colorado, US | 31 | Saturday, May 6, 2023 | 09:03:36.00 |
| Quad Rock 2022 (Quad Rock 50) | Colorado, US | 30 | Saturday, May 7, 2022 | 09:58:59.00 |
| 2021 Golden Gate Dirty 30 (50K) | Colorado, US | 29 | Saturday, June 12, 2021 | 06:34:06.00 |
| Quad Rock 2021 (Quad Rock 25) | Colorado, US | 29 | Saturday, May 8, 2021 | 04:26:09.00 |