| Leadville Trail 100 | |
|---|---|
 | |
| Date | August 18–19 |
| Location | Leadville, Colorado |
| Event type | Ultramarathon trail run |
| Distance | 100-mile (160 km) |
| Established | 1983 |
| Course records | David Roche 15:26:34 (2024); Ann Trason 18:06:24 (1994) |
| Official site | www |
The Leadville Trail 100 Run (aka The Race Across The Sky or the LT100) is an ultramarathon held annually on rugged trails and dirt roads near Leadville, Colorado, through the heart of the Rocky Mountains. First run in 1983, the race course climbs and descends 15,600 feet (4,800 m), with elevations ranging from 9,200 to 12,620 feet (2,800–3,850 m). In most years, fewer than half the starters complete the race within the 30-hour time limit.