Jason Kiefer has 5 recorded races from Leadville, Colorado, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-08-10 | 2025 Life Time Leadville 10K presented by La Sportiva | 10K | 42:41 | 10 |
| 2025-08-09 | 2025 Life Time Leadville Trail 100 MTB Leadville 100 MTB - Elite Men | Ultra Marathon | 8:01:05 | 52 |
| 2025-07-12 | 2025 Life Time Silver Rush Events Silver Rush 50 Run | Ultra Marathon | 8:04:03 | 16 |
| 2025-06-28 | 2025 Life Time Leadville Trail Marathon & Heavy Half | Marathon | 4:33:00 | 20 |
| 2022-08-13 | 2022 Stages Cycling Leadville Trail 100 MTB LT100 Pro | Ultra Marathon | 7:20:47 | 45 |