800km self-supported through Spanish deserts and 3,400m alpine passes. Where ultra-endurance meets extreme heat.
The Race Across the Sky. 100 miles at 10,000+ feet. The belt buckle that defines mountain biking.
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Both races score 89 — it comes down to what you value most.
"The world's hardest gravel race—800km through Spanish deserts and alpine passes, completely self-supported."
"The mountain bike endurance race that defines the category. Bucket list for a reason."
Badlands rates as the more demanding race based on our composite difficulty score (averaging length, technicality, elevation, climate, and altitude ratings). If you're looking for the bigger challenge, go with Badlands. If you want a more accessible race, Leadville Trail 100 MTB is the better pick.
Both races score 89/100 in our Gravel God Rating — a dead heat. They excel in different dimensions, so the best pick depends on your priorities.
Badlands is generally more accessible for first-time gravel racers, factoring in distance, technicality, and logistical ease. Check each race's full profile for distance options and beginner-specific advice.
Both races take place in August, which means you may need to choose between them. Check the official race websites for exact 2026 dates.
Badlands is held in Granada, Andalusia, Spain. Leadville Trail 100 MTB is held in Leadville, Colorado. Consider travel logistics, especially if you're flying in — check our full race profiles for airport and lodging details.
Get a personalized training plan for either race — tailored to your fitness, schedule, and goals.
$15/week, capped at $249. One-time payment.