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Race Overview
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.
WikipediaFAQ
When is the 2027 Leadville Trail 100?
The 2027 Leadville Trail 100 will be held on Saturday August 21, 2027.
What is the time limit for the Leadville Trail 100?
The time limit for the Leadville Trail 100 is 30 hours.
Leadville Trail 100 Course Map
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Leadville Trail 100 Weather History
Leadville Trail 100 Weather Averages
Average Temp: 57°, Average Low: 40°, Average High: 73°
| Time | 4AM | 5AM | 6AM | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM | 5PM | 6PM | 7PM | 8PM | 9PM | 10PM | 11PM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 45° | 42° | 42° | 43° | 51° | 57° | 63° | 67° | 69° | 69° | 69° | 68° | 71° | 70° | 68° | 63° | 60° | 58° | 55° | 52° |
| Feel | 43° | 40° | 40° | 42° | 50° | 57° | 63° | 67° | 69° | 69° | 69° | 68° | 71° | 70° | 68° | 63° | 60° | 58° | 55° | 51° |
| Rain | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Wind | 4mph | 5mph | 4mph | 3mph | 3mph | 2mph | 3mph | 9mph | 13mph | 9mph | 10mph | 12mph | 12mph | 11mph | 13mph | 9mph | 10mph | 7mph | 4mph | 6mph |
| Dew | 35° | 35° | 35° | 35° | 38° | 37° | 38° | 35° | 34° | 34° | 34° | 34° | 32° | 32° | 31° | 36° | 37° | 38° | 38° | 39° |
| RunScore |  | | | | | | | |  | | | | | | | | |  | | |
Leadville Trail 100 2026
Aug 22, 2026
Becoming cloudy in the afternoon with rain.
Low: 44°, High: 73°, Light Rain
| Time | 4AM | 5AM | 6AM | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM | 5PM | 6PM | 7PM | 8PM | 9PM | 10PM | 11PM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 51° |  47° | 47° |  44° | 54° | 59° | 64° | 70° | 73° | 66° |  64° | 64° |  69° | 69° | 63° | 52° | 52° | 52° | 52° | 51° |
| Feel | 51° | 45° | 44° | 41° | 54° | 59° | 64° | 70° | 73° | 66° | 64° | 64° | 69° | 69° | 63° | 52° | 52° | 52° | 52° | 51° |
| Rain | - | - | - | - | - | - | - | - | - | - | - | - | light | - | - | light | light | - | - | - |
| Wind | 5mph | 5mph | 6mph | 5mph | 0mph | 0mph | 3mph | 3mph | 10mph | 8mph | 14mph | 9mph | 1mph | 4mph | 18mph | 9mph | 5mph | 5mph | 5mph | 7mph |
| Dew | 39° | 40° | 38° | 38° | 41° | 41° | 41° | 37° | 35° | 40° | 40° | 43° | 37° | 39° | 42° | 48° | 50° | 49° | 49° | 50° |
| RunScore | | | | | | | | | | | | |  | | | | | | | |
Leadville Trail 100 2025
Aug 16, 2025
Partly cloudy throughout the day with afternoon rain.
Low: 46°, High: 68°, Light Rain
| Time | 4AM | 5AM | 6AM | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM | 5PM | 6PM | 7PM | 8PM | 9PM | 10PM | 11PM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 46° | 48° | 47° | 47° | 52° | 54° | 58° | 62° | 61° | 64° | 63° | 64° | 67° | 67° | 68° | 64° | 59° | 55° | 50° | 46° |
| Feel | 45° | 45° | 43° | 45° | 52° | 54° | 58° | 62° | 61° | 64° | 63° | 64° | 67° | 67° | 68° | 64° | 59° | 55° | 50° | 42° |
| Rain | - | - | - | - | - | - | - | - | - | light | - | - | - | - | - | - | - | - | - | - |
| Wind | 3mph | 6mph | 8mph | 5mph | 8mph | 6mph | 6mph | 7mph | 10mph | 5mph | 0mph | 6mph | 11mph | 14mph | 8mph | 15mph | 14mph | 7mph | 5mph | 8mph |
| Dew | 38° | 39° | 39° | 40° | 42° | 43° | 43° | 42° | 45° | 42° | 41° | 36° | 37° | 37° | 37° | 40° | 39° | 40° | 39° | 37° |
| RunScore | | | | | | | | | | | | | | | | | | | | |
Leadville Trail 100 2024
Aug 17, 2024
Clear conditions throughout the day with late afternoon rain.
Low: 36°, High: 77°, Light Rain
| Time | 4AM | 5AM | 6AM | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM | 5PM | 6PM | 7PM | 8PM | 9PM | 10PM | 11PM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 41° | 38° | 36° | 38° | 47° | 58° | 69° | 71° | 73° | 74° | 77° | 76° | 75° | 72° | 69° | 66° | 64° | 63° | 61° | 58° |
| Feel | 38° | 34° | 34° | 38° | 45° | 58° | 69° | 71° | 73° | 74° | 77° | 76° | 75° | 72° | 69° | 66° | 64° | 63° | 61° | 58° |
| Rain | - | - | - | - | - | - | - | - | - | - | - | - | - | - | light | - | - | - | - | light |
| Wind | 5mph | 6mph | 3mph | 0mph | 6mph | 0mph | 0mph | 15mph | 13mph | 9mph | 8mph | 3mph | 11mph | 9mph | 10mph | 5mph | 10mph | 10mph | 0mph | 4mph |
| Dew | 32° | 31° | 31° | 32° | 32° | 32° | 32° | 32° | 32° | 32° | 32° | 34° | 37° | 37° | 37° | 35° | 35° | 37° | 37° | 43° |
| RunScore | | | | | | | | | | | | | | | | | | | | |
Leadville Trail 100 2023
Aug 19, 2023
Clear conditions throughout the day.
Low: 40°, High: 77°
| Time | 4AM | 5AM | 6AM | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM | 5PM | 6PM | 7PM | 8PM | 9PM | 10PM | 11PM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 45° | 40° | 43° | 43° | 53° | 58° | 63° | 68° | 72° | 74° | 75° | 68° | 76° | 77° | 73° | 71° | 68° | 66° | 63° | 59° |
| Feel | 43° | 40° | 42° | 43° | 53° | 58° | 63° | 68° | 72° | 74° | 75° | 68° | 76° | 77° | 73° | 71° | 68° | 66° | 63° | 59° |
| Rain | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Wind | 5mph | 0mph | 4mph | 0mph | 0mph | 3mph | 7mph | 10mph | 18mph | 6mph | 13mph | 22mph | 18mph | 18mph | 14mph | 8mph | 13mph | 10mph | 1mph | 1mph |
| Dew | 38° | 36° | 38° | 38° | 42° | 41° | 42° | 36° | 34° | 32° | 34° | 38° | 27° | 22° | 18° | 32° | 35° | 35° | 36° | 37° |
| RunScore | | | | | | | | | | | | | | | | | | | | |
Leadville Trail 100 2019
Aug 17, 2019
Clear conditions throughout the day.
Low: 35°, High: 68°
| Time | 4AM | 5AM | 6AM | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM | 5PM | 6PM | 7PM | 8PM | 9PM | 10PM | 11PM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp | 39° | 38° | 35° | 42° | 48° | 54° | 59° | 66° | 64° | 65° | 66° | 68° | 68° | 66° | 66° | 64° | 58° | 53° | 50° | 47° |
| Feel | 37° | 34° | 35° | 41° | 48° | 54° | 59° | 66° | 64° | 65° | 66° | 68° | 68° | 66° | 66° | 64° | 58° | 53° | 50° | 42° |
| Rain | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Wind | 3mph | 6mph | 0mph | 3mph | 0mph | 0mph | 0mph | 9mph | 15mph | 16mph | 17mph | 22mph | 17mph | 9mph | 15mph | 6mph | 6mph | 5mph | 8mph | 10mph |
| Dew | 29° | 29° | 28° | 29° | 32° | 31° | 32° | 27° | 22° | 25° | 24° | 20° | 23° | 24° | 23° | 26° | 28° | 28° | 27° | 27° |
| RunScore | | | | | | | | | | | | | | | | | | | | |