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Trail running races in December 2025 - 2026: ultramarathons in North America
Blood Rock 100 Mile & 50 Mile
Pelham, USA
05 Dec, 2025 (Fri)
Trail running
55 km, 50 mi, 100 mi +1 more
Costa Rica Trail - La Transtica
Quepos, Costa Rica
05 Dec, 2025 (Fri)
Trail running
120 km, 200 km
Quiet Silence 50k
Lake Mills, USA
05 Dec, 2025 (Fri)
Trail running
50 km
Anza Borrego Cuyamaca 50 Mile Run
Julian, USA
06 Dec, 2025 (Sat)
Trail running
50 mi
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Arctic Frog Run | Libertyville, IL
Libertyville, USA
06 Dec, 2025 (Sat)
Trail running
50 km +4 more
Bigfoot 50K
Kimbolton, USA
06 Dec, 2025 (Sat)
Trail running
50 km +2 more
Brazos Bend 100
Needville, USA
06 Dec, 2025 (Sat)
Trail running
50 mi, 100 mi +2 more
Calero Trail Run - Winter
San Jose, USA
06 Dec, 2025 (Sat)
Trail running
50 km +7 more
Caloosahatchee Ultra 50k and 25k
Alva, USA
06 Dec, 2025 (Sat)
Trail running
50 km +1 more
Cloudland Canyon 50k / Half Marathon
Rising Fawn, USA
06 Dec, 2025 (Sat)
Trail running
50 km, 50 mi +1 more
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