| Robert Youngren's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Hardrock 100 2015 | Alabama, US | 41 | Friday, July 10, 2015 | 37:22:04.00 |
| Hardrock 100 2013 | Alabama, US | 39 | Friday, July 12, 2013 | 31:19:30.00 |
| Hardrock 100 2009 | Alabama, US | 35 | Friday, July 10, 2009 | DNF |
| Hardrock 100 2008 | Alabama, US | 34 | Friday, July 11, 2008 | 33:36:13.00 |
| Hardrock 100 2006 | Alabama, US | 32 | Friday, July 14, 2006 | DNF |
| Hardrock 100 2005 | Alabama, US | 31 | Friday, July 8, 2005 | 43:43:26.00 |
| Hardrock 100 2001 | Alabama, US | 27 | Friday, July 13, 2001 | DNF |
| Hardrock 100 1999 | Alabama, US | 25 | Friday, July 9, 1999 | 37:50:48.00 |