| Britney Tonning's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Red Feather Trail Jamboree 2025 Half Marathon (Half Marathon) | Colorado, US | 37 | Sunday, September 28, 2025 | Not yet started |
| Britney Tonning's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Red Feather Trail Jamboree 2025 Half Marathon (Half Marathon) | Colorado, US | 37 | Sunday, September 28, 2025 | Not yet started |