| William Wittwer's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| The Bear 100 2025 | Utah, US | 30 | Friday, September 26, 2025 | 32:58:44.00 |
| 2023 DC Peaks (50 Miler) | Utah, US | 28 | Saturday, October 7, 2023 | 12:48:35.00 |
| The Bear 100 2020 | Utah, US | 25 | Friday, September 25, 2020 | DNF |
| The Bear 100 2019 | Utah, US | 24 | Friday, September 27, 2019 | 35:15:28.00 |