| Mark Marzen's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| The Bear 100 2025 | Colorado, US | 39 | Friday, September 26, 2025 | 23:30:16.00 |
| The Bear 100 2024 | Colorado, US | 38 | Friday, September 27, 2024 | DNF |
| Never Summer 100k (2018) | Colorado, US | 31 | Saturday, July 28, 2018 | 11:47:46.00 |
| Blue Sky Trail Marathon (2017) | CO | 31 | Saturday, October 21, 2017 | 03:37:42.00 |