| Justin Grunewald's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| 2024 West Line Winder Trail Races (50k) | Colorado, US | 38 | Saturday, September 28, 2024 | 03:54:17.00 |
| Never Summer 100k (2024) (100k) | Colorado, US | 38 | Saturday, July 27, 2024 | 11:39:48.00 |
| Quad Rock 2022 (Quad Rock 25) | Minnesota, US | 36 | Saturday, May 7, 2022 | 03:19:45.00 |
| 2021 Silverton Ultra Dirty (60K) | Colorado, US | 35 | Saturday, August 7, 2021 | 06:08:42.00 |