Nathan Kullbom has 4 recorded races from Iowa City, Iowa, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-06-28 | Life Time Lutsen 99er presented by Visit Cook County Lutsen99er | Ultra Marathon | 5:14:09 | 6 |
| 2024-06-29 | 2024 Life Time Lutsen 99er Lutsen99er | Ultra Marathon | 4:35:19 | 4 |
| 2023-09-16 | 2023 Life Time Chequamegon MTB Festival presented by Trek Pro/Elite Chequamegon 40 | Ultra Marathon | 2:12:02 | 34 |
| 2022-06-25 | 2022 Lutsen 99er | Ultra Marathon | 5:43:25 | 33 |