| Brook Koski's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Quad Rock (2019) (Quad Rock 25) | Colorado, US | 56 | Saturday, May 11, 2019 | 06:38:57.00 |
| 2018 Rattlesnake Ramble (Full Course) | CO | 55 | Saturday, September 15, 2018 | 00:50:56.00 |
| 2016 Rattlesnake Ramble (Full Course) | 53 | Saturday, September 10, 2016 | 00:54:14.00 | |
| 2013 Rattlesnake Ramble (Full Course) | 50 | Saturday, November 9, 2013 | 00:52:44.00 | |
| 2012 Rattlesnake Ramble (Full Course) | 49 | Saturday, September 15, 2012 | 00:52:38.00 | |
| 2011 Rattlesnake Ramble (Full Course) | 48 | Saturday, September 17, 2011 | 00:52:43.00 | |
| 2010 Rattlesnake Ramble (Full Course) | 47 | Saturday, September 18, 2010 | 00:48:08.00 |