| Billy Simpson's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Hardrock 100 2017 | Tennessee, US | 62 | Friday, July 14, 2017 | 35:46:54.00 |
| Hardrock 100 2015 | Tennessee, US | 60 | Friday, July 10, 2015 | 37:19:57.00 |
| Hardrock 100 2014 | Tennessee, US | 59 | Friday, July 11, 2014 | 33:03:54.00 |
| Hardrock 100 2013 | Tennessee, US | 58 | Friday, July 12, 2013 | 33:14:43.00 |
| Hardrock 100 2012 | Tennessee, US | 57 | Friday, July 13, 2012 | 33:34:00.00 |
| Hardrock 100 2011 | Tennessee, US | 56 | Friday, July 15, 2011 | 35:55:00.00 |
| Hardrock 100 2009 | Tennessee, US | 54 | Friday, July 10, 2009 | 34:26:00.00 |
| Hardrock 100 2008 | Tennessee, US | 53 | Friday, July 11, 2008 | 41:07:01.00 |
| Hardrock 100 2007 | Tennessee, US | 52 | Friday, July 13, 2007 | 36:34:30.00 |
| Hardrock 100 2006 | Tennessee, US | 51 | Friday, July 14, 2006 | 33:59:15.00 |
| Hardrock 100 2004 | Tennessee, US | 49 | Friday, July 9, 2004 | 36:38:46.00 |