Mark Ratzburg has 4 recorded races from Madison, Wisconsin, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-09-13 | 2025 Life Time Chequamegon MTB Festival Chequamegon 40 | Ultra Marathon | 3:52:31 | 794 |
| 2024-09-14 | 2024 Life Time Chequamegon MTB Festival presented by Trek Chequamegon 40 | Ultra Marathon | 3:41:15 | 803 |
| 2023-09-16 | 2023 Life Time Chequamegon MTB Festival presented by Trek Chequamegon 40 | Ultra Marathon | 3:48:55 | 801 |
| 2022-09-17 | 2022 Chequamegon MTB Festival Chequamegon 40 | Ultra Marathon | 4:41:51 | 1100 |