Curt Irwin has 5 recorded races from Madison, Wisconsin, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-09-13 | 2025 Life Time Chequamegon MTB Festival Chequamegon 40 | Ultra Marathon | 2:43:06 | 72 |
| 2024-09-14 | 2024 Life Time Chequamegon MTB Festival presented by Trek Chequamegon 40 | Ultra Marathon | 2:38:35 | 53 |
| 2023-09-16 | 2023 Life Time Chequamegon MTB Festival presented by Trek Chequamegon 40 | Ultra Marathon | 2:42:57 | 40 |
| 2023-06-24 | 2023 Stages Cycling Lutsen 99er Lutsen99er | Ultra Marathon | 5:54:18 | 54 |
| 2022-09-17 | 2022 Chequamegon MTB Festival Chequamegon 40 | Ultra Marathon | 2:39:12 | 76 |